Select the Statement That Best Explains the Reason Why It

Select the statement that best explains the reason why it has not been possible to develop a vaccine for HIV.

A) In many cases, as with human immunodeficiency virus (HIV) , it has not been possible to develop a vaccine. HIV rapidly replicates and undergoes mutations so frequently that even small changes in its proteins make the virus unrecognizable to host immune cells.
B) The identification of the metabolic process and subtypes of the human immunodeficiency virus are not yet fully understood, so there has not been enough time to create a vaccine that would protect against all of the subtypes of HIV.
C) The macrophages, dendritic cells, and T and B cells interact with the protein components of HIV, and therefore no vaccine can be developed until a solution to the interaction between the cells of the body and the protein components is found.
D) None of these are correct.