Which of the following parts of the alimentary canal carries out the complete digestion of carbohydrates proteins and fats?

Correct option is A

• The small intestine is the primary site for the complete digestion of carbohydrates, proteins, and fats. It is where enzymes from the pancreas and bile from the liver help break down food into absorbable nutrients.
• The large intestine primarily absorbs water and electrolytes, and it does not carry out digestion of carbohydrates, proteins, and fats.
• The stomach plays a role in the digestion of proteins (through pepsin) and fats (through gastric lipase), but it doesn't complete digestion of carbohydrates, proteins, or fats.
• The oesophagus only serves as a passage for food from the mouth to the stomach and does not participate in digestion.