What Does the Author of the Text Mean by the "Biological

What does the author of the text mean by the "biological sexism" of sexually transmitted infections (STIs) ?

A) Men are more likely to transmit STIs than are women.
B) Men can more easily tell if their sexual partners are infected with STIs.
C) Women are more vulnerable to infection and long-term effects of STIs than men.
D) There are fewer barrier techniques available to women to protect them from STIs.