You are presented with the quiz "Which power source reduces greenhouse gases" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "using renewable resources to generate power reduces greenhouse gases" and "wind is a renewable energy source". So, what's the best answer to the question?

Choose from: (I) Coal. (II) Wind. (III) energy. (IV) Petroleum. (V) trees. (VI) Natural Gas. (VII) Heat. (VIII) motors.
Answer:
(II)