Instructions: 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").
Input: Fact1: faulting of rock in Earth 's crust causes earthquakes, Fact2: Earthquakes can cause a tsunami., Question: Tsunamis are often cause by what in the earth's crust? (A) waves (B) faulting. (C) flooding (D) pressure (E) friction (F) Movement (G) erosion (H) heat
Output:
B