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: ice wedging is when ice causes rocks to crack by expanding in openings, Fact2: An ordinary ice road is therefore severely damaged by cracks induced by the traffic., Question: Ice wedging causes what to be severely damaged? (A) an object (B) ice roads (C) lights (D) fields (E) trees (F) vehicles (G) arteries (H) coastlines
Output:
B