CEa_NoCredit

What is the real purpose of an oil refinery?
 * A: A refinery is where an oil well extracts oil from underground.
 * B: A refinery is where crude oil is burned so that only gasoline remains.
 * C: A refinery is where carbon and hydrogen atoms are assembled into alkane fuels.
 * D: A refinery is where crude oil is heated and vaporized, so that different molecules can be isolated.