Suppose That Emma and Bill Have Been Dating One Another

Suppose that Emma and Bill have been dating one another for several months. According to evolutionary theory, and assuming that Emma and Bill are like most women and men, are they likely to be more concerned about sexual fidelity (i.e., whether their partner is cheating) or emotional fidelity (i.e., whether their partner is attached to someone else) ?

A) Both are likely to care more about sexual fidelity.
B) Both are likely to care more about emotional fidelity.
C) Emma is likely to care more about Bill's sexual fidelity, but Bill is likely to care more about Emma's emotional fidelity.
D) Emma is likely to care more about Bill's emotional fidelity, but Bill is likely to care more about Emma's sexual fidelity.