Arthur Did Not Work Very Hard on His Last Class

Multiple Choice

Arthur did not work very hard on his last class essay assignment,so he was relieved at first to find that he had gotten aC.But when he learned that most of his classmates had gotten Bs and As,he felt unhappy and angry about his grade.Arthur's experience is best explained in terms of

A) the adaptation-level phenomenon.
B) the relative deprivation principle.
C) displacement.
D) Parkinson's second law.