In Paragraph 2, the word "legitimate" most probably means______.

A．requires considerable sacrifice on both partners
B．requires that the couple be emotionally involved
C．allows for the growth of the husband and wife as a couple and as two individuals
D．is only an illusion in today's society

A．if the marital life is imperfect
B．if it leads to a more worthwhile life for the two persons
C．if the couple later get married again and find real love
D．if the couple live far away from each other