Refer to the Figure

Refer to the figure.
The figure illustrates the sites of actions of various antiretroviral drugs used to treat HIV and AIDS. The fusion inhibitor, or entry inhibitor, acts at which point in the HIV replication cycle?

A) Before the virus enters the cell
B) Just as the virus enters the cell
C) Before the viral RNA is copied to DNA
D) Before the viral DNA is inserted into the host cell
E) Before new viral proteins are cut into short, functional lengths