The correct option is C Bacteria
Bacteria are prokaryotes. They grow and reproduce by binary fission.
In unicellular organisms, there is no elaborate mechanism for reproduction. The cell just undergoes simple binary fission. And growth as such in unicellular forms is just the formation of the new cell after binary fission. Reproduction is synonymous with growth in them.
Whereas in multicellular organisms, growth is by mitosis and during sexual reproduction, the gametes are formed by meiosis.
In Hydra reproduction is asexual by a process called budding. Humans reproduce sexually. Planaria has both sexual and asexual reproduction.