The correct option is C Prokaryota
Eukaryota includes mostly multicellular organisms which are characterized by the presence of a membrane-bound true nucleus and other membrane-bound organelles in the cytoplasm. Mycota includes multicellular, eukaryotic, heterotrophic fungi. Thallophyta includes organisms with eukaryotic thalloid plant body. Both, mycota and Thallophyta are placed under Eukaryota. Prokaryota includes mostly unicellular organisms which are characterized by the absence of membrane-bound true nucleus and other membrane-bound organelles. Thus, the correct answer is option D.