Why Is It Difficult to Predict the Total Number of Acquired

Multiple Choice

Why is it difficult to predict the total number of acquired immune deficiency syndrome (AIDS) cases that will result from known HIV-infected patients?

A) After a person is infected, the signs of AIDS infection might not be apparent for years.
B) The current treatment of highly active antiretroviral therapy (HAART) alters the infected cells.
C) Infected cells begin to change only after azidothymidine (AZT) treatment is started.
D) So many people have received the vaccine that there is no way to count who actually has the infection.