Possible answers: [I] Carburator. [II] burning. [III] driving. [IV] Engine. [V] Transmission. [VI] Exhaust. [VII] coal. [VIII] fronts.
Q: You are presented with the quiz "What part of the car needs a fossil fuel to run?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "acar engine usually converts gasoline into motion and heat through combustion" and "energy pollution Cars operate mainly on gasoline, a fossil fuel". So, what's the best answer to the question?
A:
[IV]