Which of the following is the most common way for a woman to contract HIV in the United States?

A) by using intravenous drugs
B) through unprotected sex with a woman
C) through unprotected sex with a man
D) None of these answers is correct.

The most common way for a woman to contract HIV in the United States is through unprotected sex with a man. According to the Centers for Disease Control and Prevention (CDC), heterosexual contact was the most common transmission category for women living with HIV in 2018, accounting for 87% of all new diagnoses. Intravenous drug use and unprotected sex with other women are also risk factors for HIV transmission, but they are less common among women in the United States.