In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: Bottleneck effect occurs when a population suddenly gets much smaller., Fact2: Populations are large groups of individuals., Question: what suddenly gets much smaller with the bottleneck effect (A) a lot of human deaths (B) tectonic plates being pushed together (C) our nearest star (D) Decreased precipitation (E) Inches or fractions of inches. (F) large groups of individuals (G) the wearing away of rock (H) a hemisphere is tilted away from the sun
A:
F