The Structure of the Anti-HIV Drug Azidothymidine (AZT)includes a Phosphate

The structure of the anti-HIV drug azidothymidine (AZT) includes a phosphate group,a sugar group,and a nitrogen base,in the form of a nucleotide.Given its structure,how do you think it blocks viral replication?

A) It inhibits host T cells from replicating.
B) It blocks RNA synthesis by an enzyme.
C) It prevents HIV from entering the cell.
D) It inhibits the assembly of new viruses in the cell.
E) It blocks host cell DNA synthesis by an enzyme.