An Example of the Evolutionary Model of Extramarital Sex as Applied

An example of the evolutionary model of extramarital sex as applied to extradyadic sex would be

A) a woman having an older wealthier husband and participating in an extradyadic sex with many younger men to try to get pregnant.
B) a man having children by more than one partner in order to increase his gene pool survival.
C) evaluating what you expect from the relationship,what you perceive your spouse expects and the costs involved.
D) participating in an accidental extramarital relationship.