Which of the Following Is the Best Example of Social

Which of the following is the best example of social facilitation on the tennis court?

A) Andie, who is learning a new swing, practices alone and gradually improves.
B) Johnny, who is an expert tennis player, prefers to practice by himself because he feels he performs better when there is little pressure.
C) Mary, who is a novice tennis player, chokes during her first game in front of an audience and loses.
D) Louie, who is an expert tennis player, plays in front of a large crowd and wins his match.