Which Situation Below Best Exemplifies the Tenet of Social Impact

Which situation below best exemplifies the tenet of social impact theory that strength is directly related to conformity?

A) When eating with strangers,Suzie will talk with her mouth full,but not when eating with her friends.
B) When Adam is with his "slacker" friends,he doesn't take school seriously; when he's at home alone,he studies for hours on end.
C) When Jason's friends use subtle influence attempts,he conforms; when they use coercive tactics,he resists them.
D) One-on-one,Melissa will talk a blue streak,but when she's in a group,she's very quiet.