Factors That Govern Microevolution Are Rooted in Two Related Phenomena

Factors that govern microevolution are rooted in two related phenomena, they are

A) first, introduction of new genetic variation into a population and second, mutations.
B) first, altering the prevalence of a given allele or genotype in a population and second mutations.
C) first, introduction of new genetic variation into a population and altering the prevalence of a given. allele or genotype in a population.
D) first, splitting up a population and second migration.
E) first, nonrandom mating and second no natural selection.