Which of the following is transmitted through direct contact with the blood or body fluid of someone who is infected (usually through unprotected sex, sharing needles, or passed from a mother to a baby at birth)? Symptoms may take 10 years or more to show. Once they appear, the person is susceptible to life-threatening infections.

D Cytomegalovirus A Herpes simplex virus B Human papillomavirus C Human immunodeficiency virus