Breast enlargement at puberty is due to ) development of the glandular structure of the breasts(b) accumulation of fat in the breasts(c) reactivation of the embryonic milk lines(d) development of the sebaceous glands located close to the areola

(B) accumulation of fat in the breasts.

Explanation:

Puberty in human females begins when ovaries begin to secrete hormone estrogen. Due to the secretion of estrogen, tissues present in the breast starts gaining fat. The addition of fat causes the breast to grow larger. Breasts also enlarge when milk ducts grow. The onset of the menstrual cycle, milk ducts for secretory glands.

the answer is d. chordata

a

explanation: