Correct option is D
As the genetic material needs to be passed on from generation to generation it must be made into copies by the process of self-replication. Also, the molecule that is the genetic material should be structurally and chemically stable as it is the information code for the organism to survive and reproduce. Slow or low rate of mutations induce variability in the population that can be sometimes favorable for the survival and sustenance under unfavorable conditions and might also lead to genetic variability./speciation.