Answer:
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 is:
C. Social exchange theory.
Step-by-step explanation:
The social exchange theory stablish that in a human relationship, the parts look the relation cost-benefit and contrast which situation could be better, in this case, having a relationship with a person specifically or being single, by that reason, under that theory, both partners need put a lot of commitment for this relation cost/benefit be high ever, that taking into account that a better person doesn't appear and the relation mentioned be more beneficial with the other person.