The organisms with cellular organization constituting multiple cells are called multicellular. The organism with a nucleus that lives in a moist place belongs to the kingdom Protista. Thus, option D is correct.
Protista is one of the five major kingdoms that are known as algae and are both unicellular and multicellular organisms that like the eukaryotes, have a central nucleus with membrane-bound specialized organelles for various functions.
They live in moist places like the marshes, damp soils, lakes, puddles, etc. necessary for their survival and reproductive cycle. Some of them are aquatic and acquire essential nutrients from the water. They feed as parasites or on the decayed and dead substances.
Therefore, option D. the organisms of the kingdom Protista are multicellular and live in a moist environment.
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