As per Whittaker's classification, an organism possessing an eukaryotic cell structure, a multicellular organisation with a cell wall and nuclear membrane showing autotrophic nutrition can be placed under the kingdom
Plantae
Kingdom Plantae includes organisms that are multicellular and eukaryotic in nature. Plants have tissue level of organisation and are autotrophs.
The cell wall is made up of cellulose.
Final answer
(c) Plantae