Concept:Maltose is a carbohydrate made of two monosaccharide units linked together.Explanation:Maltose is formed by two glucose molecules joined through a glycosidic bond.Since it contains two sugar units, it is classified as a disaccharide.It is not a monosaccharide, trisaccharide, or polysaccharide.Answer:Maltose is a disaccharide.Correct option: B. Disaccharide.