The correct answer is c) mouth.
Chemical digestion of carbohydrates begins in the mouth. When you chew food, saliva is mixed with it, which contains an enzyme called amylase. Amylase starts breaking down starches into simpler sugars. This process is crucial because it prepares the carbohydrates for further digestion in the stomach and small intestine.
While digestion continues in the small intestine and some minor breakdown occurs in the stomach, the initial step for carbohydrate digestion happens in the mouth. So next time you enjoy some starchy foods, remember that the process starts right there in your mouth!