technically Sunny and Tiffany debuted in their musicals which is a form or acting

well, Fany and Sun are musical actresses...

but i choose Hyoyeon...i know we will never see her in a drama, anyway...
Seohyun...i can't see it....unless she plays those typical non challenging roles like Yoona does....the nice girl who ends up falling in love

Hard to say. I don't think Seohyun or Hyoyeon could pull off acting

please :)

Hyoyeon and Sunny

Seo

I would like to see Seohyun

Tiffany, so she could do more for the group. She gets a lot of hate for being 'the least talented' so I think that if she brought attention to the group by acting, she could get a little less slack.

but i want to see seohyun most

tiffany can act well, but she get's nervous while doing it, i saw her in horror movie factory acting, and she almost make me cried, and i saw her dior cf and in youtube, everyone were discussing, to give a drama to her!!!
here is the link to dior cf and as you can see in the comments, everyone believes she would be good actor.

link: link

Seohyun has the talent in acting,she just need a chance