With Respect to the Well-Being of Divorced Compared to Married

With respect to the well-being of divorced compared to married individuals, the "selection effect" suggests that

A) Most problems are a result of people choosing the wrong partner.
B) People with poor well-being are more likely to get divorced.
C) After divorce, people might choose to focus on the negative feelings rather than the positive ones.
D) It is the divorce itself that causes negative well-being of divorced individuals.
E) Post-divorce unhappiness is mostly caused by a decrease in standard of living.