Answer:
The correct answer would be option C.
Plantae is a kingdom which includes photosynthetic eukaryotic organisms. It excludes fungi and few algae.
It includes angiosperms, gymnosperms, ferns, hornworts, mosses, liverworts, and green algae.
Plants contain chlorophyll containing cell organelle chloroplast which help in the process of photosynthesis.
As the cells under observation have cell wall, chloroplast, nucleus, and other membrane cell organelles thus, they must be classified as plants.