Many animal parasites and bacterial disease agents infect a fairly broad range of hosts but viruses are often very specific to one type of tissue in one or few species which of the following is not a reason to the specificity

a. viruses must be recognized and taken by a host cell
b. different host cells vary greatly in the dna or rna they will replicate
c. some viruses must be recognized and taken in by a host cell and different host cells vary greatly in the dna or rna they will replicate.
e. the genetic material of the virus must match the genetic material of the host cell.