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: when an animal moves , chemical energy is converted to mechanical energy, Fact2: Bats are animals that fly around at night., Question: What is converted into mechanical energy when bats fly? (A) batteries (B) chemical energy (C) adding heat (D) electrical energy (E) objects that have mass (F) mechanical waves (G) electricity (H) direct energy
B