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: wind is used for producing electricity, Fact2: Differential heating of air produces wind., Question: Differential heating of air can be harnessed for what? (A) Animal survival (B) direct energy (C) reducing acid rain (D) Movement of an air mass (E) heat energy (F) running and lifting (G) electricity production (H) faster movement
G