(B) The five-kingdom classification system was proposed by $R.H. Whittaker$ in $1969$. The five kingdoms defined by him are $Monera$,$Protista$,$Fungi

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(B) The five-kingdom classification system was proposed by $R.H. Whittaker$ in $1969$. The five kingdoms defined by him are $Monera$,$Protista$,$Fungi$,$Plantae$,and $Animalia$. This classification is based on criteria such as cell structure,body organization,mode of nutrition,reproduction,and phylogenetic relationships.