Q: In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
We are trying to use air as sources of energy because there is an infinite amount of it, same with water. These are two examples of (A) Coal sources (B) Fossil Fuels (C) Limited resources (D) Renewable resources
A:
D