Why a genetic bottleneck can be an important evolutionary factor for a species

Genetic drift decreases genetic diversity within a population.

Explanation:

Genetic drift decreases genetic diversity within a population. It is a change in allele frequencies due entirely to random chance and is more likely to affect smaller populations than large ones. Population bottlenecks can lead to genetic drift.

i think that the best answer would be c.

tell me if im wrong : )

i think that d. wind is the answer.   i missed the question when i answered a. currents.