Answer the following question: You are presented with the quiz "What produces electricity by burning?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "biofuel is used to produce electricity by burning" and "biofuels are alcohols, such as ethanol or other chemicals, derived from biomass or living matter".   So, what's the best answer to the question?

OPTIONS:
(I) Green beans.
(II) energy.
(III) Alcohols.
(IV) Water.
(V) Most plants.
(VI) Light.
(VII) Sand.
(VIII) heat energy.
Answer:
(III)