What Happens at an Oil Refinery

What happens at an oil refinery?

A) Oil is separated into its component compounds. surveying.
B) Oil is heated to high temperatures to evaporate off harmful impurities such as radon.
C) Oil is made more viscous by evaporating off most of the water.
D) Oil is microfiltered to remove small dirt and rock particles.
E) Oil is turned into a cleaner -burning material called synfuel.