A. Option 5 Intestinal secretion. Intestinal juice contains the enzymes maltase, lactase and sucrase that split maltose, lactose and sucrose respectively.
B. Option 3 Pancreatic secretion. Pancreatic lipase splits neutral fat into glycerol and fatty acids.
C. Option 2 Gastric secretion. Gastric juice contains the intrinsic factor needed for the absorption of Vitamin B12.
D. Option 4 Bile. Bile salts help to emulsify fat so that the fat droplets offer a large surface area to the action of lipases.
E. Option 3 Pancreatic secretion. Nucleic acids are split by pancreatic nucleases in the small intestine.