Both crude oil washing and water washing use direct impingement to remove residue from tanks. Crude oil washing has an additional advantage, in utilizing __________.

Correct Answer: Option C — the solvent effect of the crude oil

Crude oil acts as a powerful solvent for the hydrocarbons remaining in cargo tanks. While water washing relies solely on mechanical impingement, COW utilizes the chemical affinity between the crude oil and the residue to liquefy and remove stubborn deposits, significantly increasing cleaning effectiveness and reducing overall tank cleaning time.