The word "legitimate" (Line 2, Para. 2) most probably means______.

A．people have too many sources of entertainment
B．people have less internal restraints
C．people no longer enjoy family life as they did before
D．people do not want to be confined by martial ties

A．the importance of self-restraint on the parts of the husband and wife
B．the sacrifice man should make to contribute to housework
C．the tolerance of her husband's misbehavior on the part of the wife
D．the difference in value put on marriage between the husband and wife