The right option is; C
Animalia are heterotrophs, while some Protista are autotrophs best describes a characteristic of the Kingdom Animalia that differentiates them from Protista.
The Kingdom Animalia contains multicellular, eukaryotic organisms that are all heterotrophs; they rely on other organisms directly or indirectly for supply of energy in the form of food because they do not have the ability to manufacture their own food, while the Kingdom Protista contains unicellular or multicellular eukaryotic organisms that may be heterotrophic or autotrophic (synthesizes their food from inorganic substances using light energy).
