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: a flashlight converts chemical energy into light energy, Fact2: Light energy can become heat energy and heat energy can become light energy., Question: What can become heat energy? (A) objects that have mass (B) rain or sun shine (C) Chemical energy (D) hydrogen and oxygen (E) an engine (F) static electricity (G) centrifugal force (H) g forces
C