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: increasing heat causes thermal expansion, Fact2: Heating by direct heat is usually too hot., Question: What causes thermal expansion? (A) Electrical energy (B) energy of moving objects (C) making an object hot (D) cooling an object (E) freezing an object (F) chemical reaction (G) global warming (H) stretching an object
A:
C