The phrase "to shore up" in the second paragraph probably means ______.

A．The new challenge men are facing in modern society.
B．The reasons for men's feeling that they are not superior.
C．The role men are playing in the new situation.
D．The contribution of new conditions to men's weakened position.

A．the area where men can have a slight advantage has increased
B．the area where men can show their talents has decreased
C．the area where women can make full use of their talents is expanded
D．the area where women can not compete with men is reduced