You are presented with the quiz "What is required for a light bulb to produce light?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "alight bulb requires electrical energy to produce light" and "energy is used by power plants to make electricity". So, what's the best answer to the question?
Pick from: (A). garden. (B). sunlight. (C). concrete. (D). an electron lens. (E). Power plant. (F). adding heat. (G). Potted plant. (H). sun's heat.
Answer:
(E).