A mutation introduces a new skin color in a grasshopper population. Which factor might determine whether the frequency of the new allele will increase over time?

a
how many phenotypes are present
b
whether the mutation was caused by nature or by human intervention
c
how many other alleles are present
d
whether the mutation makes some grasshoppers more fit to survive in their environment

d

- whether the mutation makes some grasshoppers more fit to survive in their environment