Task: Question Understanding
Input (English): Question: How do coal and the sun compare as sources of energy? (A) Coal is renewable, and the sun is renewable. (B) Coal is renewable, and the sun is nonrenewable. (C) Coal is nonrenewable, and the sun is renewable. (D) Coal is nonrenewable, and the sun is nonrenewable.?
Output (English): coal, sun, energy?