Final answer:
The characteristics unique to the plant kingdom are autotrophy, eukaryotic cells with a nucleus, and a cell wall, making option C the correct answer.
Step-by-step explanation:
The characteristics that are only specific to the plant kingdom are autotrophy, having eukaryotic cells, and the presence of a cell wall. Therefore, the correct answer to which characteristics are only of the plant kingdom is C.autotrophic, eukaryotic cells, cell wall present. Plants use photosynthesis to create their own energy, have cells that contain a nucleus and other membrane-bound organelles (defining them as eukaryotic), and possess a cell wall which gives them structural support and protection.
The characteristic that is only present in the plant kingdom is autotrophic, eukaryotic cells, cell wall present.