Why Are Remarriage Rates Lower Today Than They Were in the 1960s

Why are remarriage rates lower today than they were in the 1960s?

A) Divorced people tend to have a series of short relationships instead of getting remarried.
B) There has been an increase in cohabitation among unmarried couples.
C) Divorce rates have dropped slightly.
D) People tend to divorce at later ages, so they are less likely to remarry.