Cells of cork contain a substance called:

The correct answer is Option (3) → Suberin

Suberin is a waxy substance in the walls of cork cells. Cork forms the outer protective layer of the bark of older stems and roots. Its cells are dead at maturity and packed closely, with no spaces between them, and the suberin in their walls makes them impervious to water and gases. This protects the plant against loss of water, injury and infection.