Final answer:
Too active sebaceous glands result in an overproduction of sebum, leading to blocked follicles and acne. Regular cleansing of the skin can help manage this condition.
Step-by-step explanation:
When the sebaceous glands (oil glands) become too active, they produce an excess amount of sebum, which is an oily substance that helps to lubricate and waterproof the skin and hair. However, too much sebum can lead to the blockage of hair follicles, which in conjunction with the accumulation of dead skin cells and bacteria can result in acne. This blockage creates an environment for bacteria to grow, leading to inflammation and the formation of pimples or acne.
Therefore, if the sebaceous glands become too active, the correct answer to the student's question is C) Acne. Regular cleansing can help manage sebum production and reduce the risk of acne.