The structure that allows a virus to recognize and attach to receptors on the host cell is capsid protein.
What is the general structure of viruses?
Viruses are more diminutive than bacteria and contain of a SsDNA or DSDNA and enclosed by a protein shell Known as a capsid.
Whereas some viruses also contain Lipid and protein outer envelope.
Thus, option "B" is correct, capsid protein.
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