The correct option is
B Secretion of milk from the mammary glands
Lactation is the secretion of milk from the mammary glands. It occurs naturally after parturition in the post pregnancy stage. The mother feeds their offspring with milk after parturition.
Dairy farm management or dairying is the management of animals for milk and its products for human consumption.
Figure : Dairying
Animal husbandry is the agricultural practice of breeding, rearing, caring and raising of livestock like buffaloes, cows, pigs, horses, cattle, sheep, camels, goats etc.
A facility that produces milk or its products is called dairy or dairy factory.