Which of the following has the same meaning as "peers" in Paragraph 7

A．Men in step-families.
B．Men in traditional families.
C．Men not living with their partners.
D．Men in non-traditional families.

A．see what kind of family environment is ideal for children to grow up in
B．investigate why so many men get depressed when a child is born
C．study whether family structure affects depression in men when child is born
D．see whether it is true that behind every depressed man there is a depressed woman