John and Katie Both Worked at the Same Firm and Lost

Multiple Choice

John and Katie both worked at the same firm and lost their jobs during the recent recession. After a period of time, they both were able to find work again, but while John's new job paid enough to sustain a comfortable lifestyle, he no longer made as much as Katie, who's new job paid even more than her old one. John is suffering from:

A) the reciprocity principle
B) in-group conflict
C) relative deprivation
D) the pleasure principle