Question

a kerosene.
b benzene.
c crude oil.
d gasoline.

Explanation:

To solve this, we need to recall the source of fuels like kerosene, benzene, gasoline. Crude oil is the raw material from which these (kerosene, benzene, gasoline) are refined. So the answer is related to the primary source.

Kerosene, benzene, and gasoline are all products refined from crude oil. So crude oil (option C) is the source material for these fuels.

Answer:

C. crude oil.