In Impact on Youth, Researchers Surveyed Boys Aged 12 to 15

In Impact on Youth, researchers surveyed boys aged 12 to 15, and asked about the motivational climate of their team, as well as their own self-esteem. What was the researchers' conclusion?

A) Environments created by teammates, coaches, and parents have an impact on children's athletic experience
B) The motivational climate was strongly correlated with the skills levels of the players
C) There was no difference in the reported self-esteem between boys playing in a mastery-focused environment and those playing in a performance-focused environment
D) The environments created by the coaches and other players affected only the perceived confidence of the players, but not their levels of enjoyment.