The kingdom of the organism in this scenario is referred to as a protist because it contains certain features such as being unicellular and possessing what we call DNA in its nucleus etc and is denoted as option D.
What is a Protist?
This is classified as an eukaryotic organism which does not belong to the animal, plant, or fungus family. it is however unicellular and has the ability to produce food on their own which is responsible for their survival in the ecosystem.
These organisms produce food through the process known as photosynthesis and examples include algae, diatoms etc. They also have DNA enclosed in their nucleus which is why they are referred as being eukaryotic.
This is therefore the reason why protist was chosen as the most appropriate choice.
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