The correct option is D Monera
Protista
All the unicellular eukaryotes are members of kingdom Protista.
Plantae
Kingdom Plantae includes all multicellular eukaryotic plants and some algae.
Monera
Sole members of the kingdom Monera are heterotrophic and autotrophic bacteria which are prokaryotes. Cyanobacteria are autotrophic and prokaryotes (lacking well-defined organelles and nuclei), hence, categorised under the kingdom Monera.
Algae
Algae are members of the division Thallophyta and are the most primitive and simplest plants.
Final answer
c. Monera