One of the implications of research findings on collective efficacy is that a. previous game performance is a more important source of collective efficacy than practice performance b. players are not likely to think much of the team's chances to win if the player has a low opinion of his own ability c. the sum of the individual players' self-efficacy is strongly related to team performance d. coaches should focus more on building the efficacy of the team as a whole than with each individual player's self-efficacy