According to , the reason for gender differences in social behavior is the way that our culture socialized boys vs. Girls.

The question is incomplete and the full version can be found online.  

d. social roles theory

Explanation:

Old-fashioned sexism is incorrect because, although supported by several biased scientific studies at the time, is not a scientific theory per se.

The theory of Normative Influence and Informational influence refers to the reasons people have to show conformity, whether it is to be accepted by others or to build an idea about reality based on other´s opinions due to the lack of personal knowledge, but they don´t have gender as a determinant factor.

Only the social roles theory specifically links the differences and similarities between the sexes to the social behavior based on the distribution of men and women into social roles in society.