The human immunodeficiency virus (HIV) infects and kills cells of the immune system. A person infected with HIV can be treated with the antiviral medication AZT. This medication slows the progression of HIV by preventing the virus from integrating into the individual's genome.

What is the best explanation of why AZT slows the progression of HIV?
A.
AZT causes HIV to replicate, which helps an individual's circulatory system recognize and destroy the virus.
B.
AZT prevents HIV from replicating, which limits its ability to destroy red blood cells.
C.
AZT causes HIV to replicate, which helps an individual's immune system recognize and destroy the virus.
D.
AZT prevents HIV from replicating, which limits its ability to destroy white blood cells.

D. AZT prevents HIV from replicating, which limits its ability to destroy white blood cells.