Answer:
B. Disaccharides
Step-by-step explanation:
Lactose is a disaccharide and consists of two monosaccharides namely galactose and glucose bonded together by a β-1→4 glycosidic linkage.
The enzyme lactase breaks down the disaccharide lactose its constituent monosaccharides. Therefore, the addition of lactase to milk reduces the amount of disaccharide and increases the number of monosaccharides.