Question

goose bumps are caused by secretions from sebaceous glands. contraction of the arrector pili muscles. increased activity of the matrix. activation of the sudoriferous glands.

Explanation:

Goose - bumps are caused when the arrector pili muscles contract. These are small muscles attached to hair follicles. When they contract, they pull the hair upright, creating the appearance of goose - bumps. Sudoriferous glands are sweat glands and not related to goose - bumps. Activity of the matrix is related to nail or hair growth. Secretions from sebaceous glands are oils for skin and hair lubrication and not related to goose - bumps.

Answer:

contraction of the arrector pili muscles.