In order to find out the short-term effect of violent video games on game players, researchers ________.

A、askedgameplayerstopunishthelosersintheviolentvideogames
B、observedthebehaviorofgameplayersplayingviolentvideogames
C、putgameplayersintoarealfightinaroomwithaggressiveopponents
D、observedgameplayers’reactiontotheirimaginaryopponentsingames