The correct option is
C Sebaceous glands
Sebum is an oily secretion of the sebaceous glands.Sebaceous glands are microscopic exocrine glands present in the skin which secrete sebum, to lubricate and waterproof the skin and hair of mammals.
Sebum
is produced in a holocrine process, in which cells within the sebaceous gland
rupture and disintegrate as they release the sebum and the cell remnants are
secreted together with the sebum. Hence option C is correct.