Regarding Those Couples Who Experience a Decline in Marital Satisfaction

Regarding those couples who experience a decline in marital satisfaction following the birth of a child,the text points out that:

A) not only couples with children,but couples generally report a decline in marital satisfaction during the first two decades.
B) when marital satisfaction is lower,so too is their dissatisfaction among the participants.
C) most couples who experience a decline in marital satisfaction were not having any serious problems before the baby came.
D) all of the above