​The Five Kingdom Classification of living organism was first proposed by:​

Correct option is C

The Five-Kingdom classification was proposed by Robert H. Whittaker in 1969. This classification system divides all life forms into five broad categories. Each kingdom is distinct in terms of its cellular composition and organization, mode of nutrition, reproduction, and phylogenetic relationships (their evolutionary history).

The five kingdoms are as follows:

·        Monera: This kingdom includes unicellular, prokaryotic organisms, which means they lack a true nucleus and other membrane-bound organelles. It comprises all bacteria, including both eubacteria and archaebacteria. Some members of this kingdom are autotrophic, usually through photosynthesis, but most are heterotrophic.

·        Protista: This kingdom is a diverse group of eukaryotic microorganisms, including amoebas, algae, protozoa, and slime molds. Many are unicellular, but some, like certain types of algae, are multicellular. Protists exhibit various nutritional modes, including photosynthesis, absorption, and ingestion.

·        Fungi: The kingdom Fungi is composed of eukaryotic, usually multicellular, heterotrophic organisms. They obtain nutrients by absorption, secreting digestive enzymes into their surroundings and then absorbing the broken-down organic materials. Examples include molds, yeasts, and mushrooms.

·        Plantae: This kingdom encompasses all plants, which are multicellular, eukaryotic organisms that are typically autotrophic, using photosynthesis to produce their own food from sunlight, water, and carbon dioxide. They have cell walls composed of cellulose.

·        Animalia: The kingdom Animalia includes all animals. These organisms are multicellular, eukaryotic, and heterotrophic, obtaining nutrients by ingestion of other organisms. They do not have cell walls and often have bodies differentiated into tissues, including nervous tissue and muscle tissue for locomotion.