Question

However, when the entire residence staff listened to our argument again, they became convinced that the system wasn't fair. however, when the entire residence staff listened to our argument again, it became convinced that the system wasn't fair. however, when the entire residence staff listened to our argument again, he became convinced that the system wasn't fair. no change?

Answer 1

There is a difference in the change of pronounce used. The best (and probably correct answer) is the first sentence: However, when the entire residence staff listened to our argument again, they became convinced that the system wasn't fair. The pronounce 'they' refer to the collective term of 'entire residence staff'.