Answer: Option D.
Protist.
Step-by-step explanation:
Amoeba and paramecia belong to kingdom protist.
This kingdom comprises of Eukaryotic organisms that are multicellular or unicellular. They have nucleus and membrane bound organelles which are use in performing life processes. Some protist are free living such as algae while some are heterotrophic and some are parasitic. They have Mitochondria and the live in moist or aquatic environment. They have cilia or flagella for loccomotion.