This is a compilation of the times BTS has answered this question. Please note that I have not included any fan-accounts/post-its because there are many and several of them have been found to be fake. People often make things up. Hence, I’ve only included OFFICIAL sources.
After School Club 2013 Q. If you had the chance to date one of your group members, who would it be? V: J-Hope (because he’s clean and tidy) Suga: Suga (The others were not asked this)
Kpoppin’ Interview 2013 Q: If you were a girl which member would you date? A: Jin says Jimin because he thinks it would be fun to tease Jimin since Jimin is so shy and soft spoken. Rap Monster says J-Hope because J-Hope is like the eomma in the dorm and Rap Monster thinks he would do that much more for his girlfriend. Suga answered Jimin, and Jungkook answered Jin. (The others were not asked this)
[EXCLUSIVE] K-POPPED! INTERVIEW WITH BANGTAN BOYS To Jimin : If you are a girl, who would you choose to date among the members? Who would be the best ‘oppa’ and why? Jimin: J-Hope. He is the most cheerful person and he takes care of someone well so he can love his girlfriend very well.
Hanryupia 2014 January Issue JIMIN:「You’re more than a close friend. You’re my savior! So you’re very precious (to me) and I want to be with you even when we become grandfathers. ♥」 V: 「It’s a bit… to accept that kind of love (laughs)」 JIMIN: 「Then, who are you going to pick among the members, if you had to be a couple!?」 V:「Maybe J-Hope. He’s funny so it feels like we can spend everyday smiling/ laughing. And he likes to be organized. If Jiminie brushes up your humor sense, I may think about it.」 JIMIN: 「Shocking! I picked V unquestioningly! (Shrinks down)」
BTS in Singapore Q. If other member’s were girls, who would you date and why? Jin: I don’t like them but Jimin is so kind and so gentleman(ly), so I want a date with Jimin.
BTS at Haru Hana Magazine Vol. 22 (Twitter Q&A)  Q: If you were a girl, who do you want to have a relationship with? JIN & JUNG KOOK: I choose myself. SUGA: If I were a girl, I think I would also want to choose myself. (smiles) I’m not playful and not talkative, and I do everything calmly… My personality just like dad. JIMIN: I choose Jungkook. He gets shy easily which is his cute side. He also has a manly side. V: I choose J-Hope hyung. Although he is not a funny guy, his smile always make people’s mood become better. RAP MON: I also choose J-Hope and Jimin. I don’t like bad woman or bad man types. I think the person who likes someone can express their feeling directly is better. If I were a girl I would choose the man that will treat me really seriously. So these two people are my answer. J-HOPE: I LOVE YOU，RAP MON . I also choose RAP MON！He is a real man, If I were a girl, I will be attracted by his voice. He might compose songs for me, it sounds pretty nice.
SKIT: SOULMATE (Skool Luv Affair)(2014) J-Hope: Let’s talk about our ideal type! V: Hyung, what’s your ideal type? J-Hope: Me? A girl like you
BTS at Haru Hana Magazine Vol. 23 (member solo question Q&A)  Question to J-Hope: In “Skit: Soulmate”, you said your ideal type would be V, is that true? A: Yes, that’s because V and me usually have a very good relationship - we’d usually make jokes, so when we were recording it, his name just automatically came out (haha). None of what’s in the Skit was pre-planned so it was very realistic.
2015 MINA FEBRUARY ISSUE If you’re a girl, which member would you date and why? JHOPE: Jimin. He looks like he’ll totally obey his girlfriend. RM: Jimin. He’s very gentle. SUGA: Me, because I like those with my type of personality. JIMIN: Jimin! Too charming! V: V. I will devote everything when I’m dating. JIN: None because I know everyone’s personality… JK: None. I absolutely do not want to date them (laughs).
TRB IN MALAYSIA 2015 Jungkook: Jimin hyung is such a nice guy. His personality is just too nice. And he (keeps giving me) nice food. And when he smiles, his eyes are so pretty. He’s the most charming guy in the team. If I were a girl, I would date a guy like Jimin hyung.
This is all I have. If anybody knows any other OFFICIAL sources where the members have answered such questions, please message me and I’ll add it to this list.
“......Open your eyes...Open your eyes. Wake up, Link....
Link...You are the light--our light--that must shine upon Hyrule
once again. Now, go......Remember...Try...Try to remember... You
have been asleep for the past 100 years. The beast...When the
beast regains its true power, this world will face its end. Now
then...You must hurry, Link. Before it's too late...”