The correct option is C Protist
Amoeba is a unicellular eukaryotic organism that is neither plant, animal, bacteria, nor fungus and has the ability to change its shape.
They are classified under the protist group. They are usually found in water bodies such as ponds, lakes and slow-moving rivers.They move by forming 'feet-like' pseudopodia, which are also used for feeding. Sometimes, they make their way inside the human body and cause severe illnesses.