Xavier, who has a negative explanatory style, is most likely to get depressed after failing a math test if he believes that he failed because

a. he is not good at math and never will be.

b. his teacher made it impossible to learn the material.

c. he was sick on the day he took the test.

d. his parents have been putting too much pressure on him and he panicked on the test.

e. the testing room was very hot and stuffy.