Muriel, Who Is Generally a Happy Person, Becomes Quite Sad

Muriel, who is generally a happy person, becomes quite sad to find out that she failed her psychology exam.When her roommate asks Muriel for a ride to the airport, Muriel should

A) be more likely to help.
B) be less likely to help.
C) focus more on the costs of helping rather than the rewards.
D) be more concerned with the potential for reciprocity.