Rannilt Was Euphoric After Learning That She Had Been Accepted

Multiple Choice

Rannilt was euphoric after learning that she had been accepted by the medical school of her choice. After a few weeks, however, she is only mildly excited when she thinks about her admission to medical school. This change in her feelings can best be explained in terms of

A) the catharsis hypothesis.
B) relative deprivation.
C) the feel-good, do-good phenomenon.
D) the adaptation-level phenomenon.