Answer is: c. Maltose.
Maltose is a disaccharide composed of two glucose molecules.
Starch (carbohydrate) is a polymeric carbohydrate consisting of a large number of glucose units bonded by glycosidic bond.
Starch is a white, tasteless and odorless powder that is insoluble in cold water or alcohol.
Food rich in carbohydrates has high energy content, because human body can digest it very fast.