Melissa and John have been happily married for 30 years because they have ensured that they have no opportunities to fight.Both of them have jobs so they contribute proportionately to the household income, and they equally share all other responsibilities.Melissa and John's happy marriage can best be explained by the

A) social exchange theory.
B) social contagion theory.
C) social identity theory.
D) elaboration likelihood model.

Social Exchange Theory

A theory suggesting that social behavior is the result of an exchange process, aiming to maximize benefits and minimize costs.

Social Contagion Theory

A social psychological theory that explains how behaviors, attitudes, and emotions can spread through populations as if they were infectious diseases.

Social Identity Theory

A theory that posits individuals derive part of their self-image and self-esteem from the social groups to which they belong, influencing behaviors and attitudes.