Q: Fact 1: Bottleneck effect occurs when a population suddenly gets much smaller. Fact 2: Animals and plants exist as populations. Given the two facts above, when an animal or plant group gets much smaller, that's called a:?

pick from the following. (A). bottleneck. (B). Winter. (C). Movement. (D). population explosion. (E). genus. (F). relocation. (G). Mason jar effect. (H). choker.
A:
(A).