Detailed 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").
Q: Fact1: when water freezes , that water expands, Fact2: Water pipes can freeze and burst., Question: Why do pipes sometimes burst during the winter (A) Water evaporating (B) flooding (C) Water expanding (D) energy usage (E) Water melting (F) Water contracting (G) colder weather (H) massive damage
A:
C