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: ice wedging is when ice causes rocks to crack by expanding in openings, Fact2: Water expands as it freezes into ice., Question: How does water crack rocks? (A) Turning to silt (B) bottom of feet (C) Turning to ice (D) Getting hot (E) erosion (F) Mixing with salt (G) lowered energy cost (H) Movement
C