Answer:
complementarity hypothesis
Step-by-step explanation:
Complementarity hypothesis exemplifies the behavior that an individual reflects as a reciprocation of the behavior of the others for them. These behavior are evoke as the result of the complementary behavior of other people. In psychology, complementarity hypothesis is the characteristic of the individual that tends them to be attractive towards people with the characteristic that complements them.
In the given situation, the attraction of Mary towards Shane is the result of complementarity hypothesis. The characteristics of Mary and Shane are complementary to each other. This builds attractive forces between them in order to compliment each other.