Mike and Sally Are in a Long-Distance Relationship but They

Mike and Sally are in a long-distance relationship but they are both very busy with their careers and don't have much free time. Since Sally feels that the relationship isn't strong enough to justify taking time off work to go visit Mike or spending the money it would cost to visit him, she decides to break things off. In this example, it appears that the costs of the relationship outweighed the benefits. Which of the following theories explains Sarah's decision to end her relationship with Mike?

A) Social exchange theory
B) Equity theory
C) Exchange relationship theory
D) The cost-benefit theory of personal relationships