A gas sweetening unit in an oil refinery uses:
a. Heat to drive off the hydrogen sulphide from the sour gas
b. An amine solution to absorb the hydrogen sulphide from the sour gas
c. An amine solution to absorb the hydrogen sulphide from the crude oil
d. Amine solution to absorb the hydrogen sulphide from the gasoline
e. Heat to drive off the hydrogen sulphide from the crude oil
Answer: B