Given the task definition and input, reply with output. 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").

Fact1: Bottleneck effect occurs when a population suddenly gets much smaller., Fact2: Effects of bottlenecks are unpredictable ., Question: What is the effect of a population suddenly getting much smaller? (A) major threat to health (B) Decreased precipitation (C) a lot of human deaths (D) movement of tectonic plates (E) it is unpredicatbale (F) If they can no longer get food (G) Plant growth is reduced (H) enormous damage to homes
E