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: microbial fuel cells convert chemical energy into electrical energy, Fact2: Electric generators convert mechanical energy into electric energy., Question: What do microbial fuel cells and electric generators both create? (A) sunlight (B) electricity (C) vehicles (D) chemical energy (E) Greenhouse gases (F) engines (G) to move people (H) light
B