A Couple Has Been Together for Several Years and They

A couple has been together for several years and they are now deciding whether to end their relationship. Based on Thibaut and Kelley's social exchange theory, one of the primary factors that will affect their decision is:

A) their mate preference patterns, which have been shaped by evolutionary forces.
B) their mate preference patterns, which are the products of learning and culturally defined roles.
C) the amount of personal self-disclosure that takes place in their relationship.
D) the relative rewards and costs that they experience when in the relationship.