The correct option is
D Starch
The carbohydrate starch is a polysaccharide. It is a mixture of amylose and amylopectin. Amylose is made up of long chain of glucose units linked by α-(1→4) glycosidic bonds and amylopectin has both (1→4) glycosidic bonds and α-(1→6) glycosidic branches. Amylase catalyzes the breakdown of starch into glucose. Thus the correct answer is option A.