Answer:
Answer is A
Explanation:
Hardy-Weinbergs equilibrium is laso referred as genetic equilibrim i.e. gene pool's frequency is not changing. Now why not other choices
if the population migrate to another geographical area so ofcourse it would have people with different genes
if that population sexually reproduce with another population it would have You know AGAIN different genes
Mutation is the change in DNA so if there is change in DNA the genetic message by the gene would not be the same as before the mutation so it also affects genetic equilibrium.
WHAT AFFECTS GENETIC EQUILIBRIUM
The Factors which affect genetic equilibrium are Mutation, Environmental Change, Natural Selection