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: mountains are formed by earthquakes, Fact2: For big mountain background, check out the Himalayas ., Question: What formed the Himalayas? (A) erosion (B) tornadoes (C) flooding (D) earthquakes (E) hurricanes (F) amount of heat (G) precipitation (H) permeable walls
A:
D