Question

What is the first step in the refining of petroleum?
A) Distillation
B) Cooling
C) Drilling
D) Cracking

Answer 1

a in this process the crude oil is heated and
and fed into a crystal column.

thanks

Answer 2

Petroleum refining is a process through which crude oil is converted into various useful products.

The first step in refining of petroleum is distillation. Under this process crude oil is heated  and fed into a distillation column. With the rise in temperature of the crude oil in the distillation column  the oil gets separated itself into different fractions. It is  then captured separately.