One Concern of Conservation Biologists Is That Endangered Species Will

One concern of conservation biologists is that endangered species will have low genetic diversity due to a small population size.Why is this a concern?

A) Sexual selection is stronger in small populations.
B) Individuals in small populations acquire mutations more slowly than those in large populations.
C) If the environment changes, individuals will not be able to change their alleles and survive.
D) If a disease occurs in the population, there may not be organisms with resistant alleles.
E) Allele frequencies are lower in smaller populations.