Given the task definition and input, reply with output. 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: temperature changing can cause phase changes, Fact2: Temperature also changes with the seasons., Question: what can cause phase changes? (A) Electrical (B) an object (C) seasons (D) imbalanced (E) hormones (F) sweating (G) Winter (H) climate
C