In the 1970s, After the Publication of Iron John, Many

In the 1970s, after the publication of Iron John, many middle-aged men went on male-bonding retreats, learned to cry, shared their feelings, and learned to be different kinds of men, which demonstrates that:

A) masculinity is more or less frozen and unchanging.
B) gender socialization is a lifelong process.
C) families are the most important element of socialization.
D) boys are more likely to get in trouble by misbehaving and therefore have distanced themselves from emotional responses.
E) gender is still largely based on hormones and neurotransmitters.