Which of the Following Illustrates How Gender Can Vary

Which of the following illustrates how gender can vary?

A) Gender tends to remain constant over time, with variation mostly related to types of clothing men and women wear.
B) Gender definitions within a society are unlikely to have much variation, unlike two different societies when compared to each other.
C) Gender varies over the life course; what it means to be a man or woman may be different at age 20 than at age 40 or age 70.
D) Gender variation is limited to industrial societies, which have seen many changes in male and female roles.