Which Relationship Does NOT Demonstrate the Social Exchange Theory

Which relationship does NOT demonstrate the Social Exchange Theory?

A) Pam and James have been married for four years. They give each other emotional support, keep arguments to a minimum, feel financially secure, and are satisfied with their relationship.
B) Stan and Teri provide emotional support to each other and have sex regularly. However, Teri can't help but be interested in other partners, and she decides to begin an affair.
C) Since Andrew lost his job one year ago, he and his wife Erin have been beset by financial troubles. Both believe that the quality of their relationship has declined as a result.
D) Mike and Jan have been together for one year. They satisfy each other sexually but have realized lately that barely a day can go by before they get into an argument. They decide to split up.