There Has Been Very Little Anthropological Research on Human Sexuality

There has been very little anthropological research on human sexuality.What is NOT one of the reasons for this?

A) The topic has been thoroughly and appropriately explored by both psychologists and sociologists.
B) Anthropologists are often ill at ease discussing human sexuality.
C) People in most societies regard their sexual activity as a very private topic.
D) Women are often reluctant to discuss their sexuality with male anthropologists.