The correct option is D All of the above
Linnaeus' Two Kingdom system of classification did not distinguish between the eukaryotes and prokaryotes, unicellular and multicellular organisms and photosynthetic (green algae) and non-photosynthetic (fungi) organisms. Moreover, the system does not include other characteristics like cell structure, nature of wall, mode of nutrition, habitat, methods of reproduction, evolutionary relationships, etc. These are some of the drawbacks of Two Kingdom system of classification.