Why must Viruses rely
on living cells for replication?

To multiply, a virus must employ cell processes. The viral replication cycle can cause significant biochemical and structural changes in the host cell, which can result in cell death. These modifications, known as cytopathic (cell-damaging) consequences, might alter cell functioning or even cause the cell to die.

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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

i believe the answer would be b. hope it : )