Most Likely
1. Minnie
2. Soojin
3. Shuhua
4. Yuqi
5. Soyeon
6. Miyeon
Least Likely
Minnie & Soojin : These two strike me as the ones that are most likely to be gay or bi. I can't really explain it, it's just a feeling.
Shuhua & Yuqi : I think these two could be bisexual. Between boys and girls the might still prefer boys a little more.
Soyeon & Miyeon : I think these two are straight or at least less likely to be bi or gay in comparison to the others.
I obviously don't know whether it's true or not and I didn't mean to offend anyone. This is purely based on a hunch. 🙈