The conversion of maltose to glucose is possible by the enzyme

Maltase

The correct answer is option 3. maltase.

Maltase is an enzyme that catalyzes the hydrolysis of maltose, a disaccharide, into two molecules of glucose. Zymase, lactase, and diastase are all enzymes that can hydrolyze different types of carbohydrates, but they do not specifically hydrolyze maltose.