Which theory of attraction suggests that long-term relationships are likely to continue when both partners are committed and put a lot into the relationship and when there are few attractive tempting alternatives around?

A. The mere exposure effect

B. evolutionary theory

C. Social exchange theory

D. The investment model

Answer: D

Explanation: The theory that suggests this is letter D, the social investment model.

This model suggests that commitment to something is influenced by three aspects: satisfaction levels, quality of alternatives and investment size. As long as both partners feel satisfied with each other, alternatives seem not likeable and they continue to invest in their relationship, they will last longer.