Coworkers, Julia and Dave, had become good friends as they had worked together on several long hard projects. Each person had different skills that contributed to their shared projects

Later, Dave was transferred to another department and constantly needed Julia's help on his
projects, while she rarely, if ever, asked him for anything. Soon, Julia began to avoid Dave.
Which interpersonal concept best describes Julia's reaction?
A. Selective attention
B. Communication omission
C. Contingency theory
D. Social exchange theory

D