Which of these is the best example of fear being a positive emotion?

A. Joel figures that he will probably fail a test, so he does not study.
B. Michelle decides to walk with friends after several robberies in the area.
C. Kiki is afraid that she will miss if she tries to score herself, so she always passes the ball.
D. Tyrone wants to join an after-school club but is afraid it will take up too much time.