Benny Received a C on His Psychology Exam and an a on His

Benny received a C on his Psychology exam and an A on his Western Civilization exam.Which of the following would best reflect Benny's reasoning if he exhibited a self-serving bias?

A) His Psychology grade was because he was coming down with the flu and his Western Civilization grade was because the professor was an easy grader.
B) His Psychology grade was because he is not good with understanding abstract concepts and his Macroeconomics grade was because the professor was an easy grader.
C) His Psychology grade was because he was coming down with the flu and his Western Civilization grade was because he has an innate gift for understanding the past.
D) His Psychology grade was because he does not study and his Western Civilization grade was because the professor happened to ask the questions he studied the most.