In para 5, the author says that most cohabitation breaks up within two years. In his opinion, why does not cohabitation ordinary last very long?
A.
Because cohabiting women are too dedicated to their pursuit of career.
B.
Because cohabiting men spend too much time on their pursuit of leisure.
C.
Becuase cohabiting couples have changing expectations about each other.
D.
Because cohabiting couples are under social pressure to end cohabitation.