Why Are Couples Who Cohabitate Before Becoming Engaged More Likely

Why are couples who cohabitate before becoming engaged more likely to divorce than individuals who cohabitate only after an engagement or never live together before getting married?

A) Cohabitation and prodivorce attitudes are highly correlated.
B) Cohabitation before an engagement is associated with infidelity, which often persists after the couples marry.
C) Couples who cohabitate before an engagement tend to be from lower socioeconomic backgrounds and poverty increases the risk for divorce.
D) Couples who cohabitate before getting engaged tend to have lower relationship commitment when they get married than other couples.
E) both b and c