According to the textbook, the pathway of milk transport is as follows: The cells of alveoli (c) secrete milk, which opens into mammary tubules (e). The tubules of each lobe join to form a mammary duct (a). Several mammary ducts join to form a wider mammary ampulla (d), which is connected to the lactiferous duct (b) through which milk is sucked out . Therefore, the correct sequence is c → e → a → d → b.