The term "sex" refers to:

a. human reproductive activities and functions

b. cultural categories related to the indentities and roles of men and women

c. biological traits that distinguish males and females

d. socially defined identities of men and women

e. all of the above

All of the above.

Explanation:

Sex is a biological as well as sociological term used to determine the two different sexes that is male and female. The sex identifies an individual whether the individual is female or male.

The sex also determines the reproductive function and activities of male and female and their cultural role in the society. Sex determines the biological differences between male and female.

Thus, the correct answer is option (e).