Explanation:

- Option 1: Mouth

- Digestion starts here, mainly mechanical (chewing) and some chemical (saliva enzymes break down starch).

- Option 2: Small intestine

- Correct Answer

- This is where food digestion is completed. Digestive juices from the pancreas and liver break down proteins, fats, and carbs into absorbable molecules.

- Option 3: Stomach

- Mainly breaks down proteins and mixes food, but doesn't finish the process.

- Option 4: Large intestine

- Absorbs water and minerals. No major digestion happens here, just processing of leftovers.