In Amoeba, food is digested in the:

Amoeba digests their food in the food vacuoles. They can change their shape by extending and retracting its pseudopods.
The food is ingested through phagocytosis, which engulfs the food particles. 

Once the food is engulfed, the cell membrane encloses it, creating the food vacuole. Inside this vacuole, digestive enzymes break down the food into simpler substances that are absorbed into the cytoplasm for energy and growth. Any undigested material is expelled from the cell, completing the digestion process efficiently. This unique mechanism enables Amoeba to adapt and survive in its environment.

Hence, the correct option of food vacuole.