Final answer:
Option D). Glycoproteins are embedded in the viral envelope and help the virus attach to the host cell. HIV uses glycoproteins to bind to the CD4 molecule on T lymphocytes as one of its receptors.
Step-by-step explanation:
Proteins that have sugar molecules bonded to them are known as glycoproteins. Glycoproteins are frequently used by viruses to bind to host cells through molecules on the cell known as viral receptors. The viral envelope contains glycoproteins that aid in the virus's attachment to the host cell. This attachment makes it easier for the virus to subsequently pass through the cell membrane and finish replicating inside the cell. For instance, HIV binds to one of its receptors, the CD4 molecule on T lymphocytes, using glycoproteins.