Approximately 40% of Couples Who Cohabited Prior to Marriage Later

Approximately 40% of couples who cohabited prior to marriage later divorce. What is the hypothesis for why this occurs?

A) The couples are simply getting married because they lived together and feel it is the next step.
B) The couples have a lower level of religiosity and less commitment to the values and interests associated with marriage
C) The couples tend to be too young to fully comprehend the commitment involved in marriage.
D) After living together, the couples tend to desire their independence again.