The correct option is C Four kingdoms
There are five kingdoms in the Whittaker’s Five Kingdom Classification System. They are Monera, Protista, Fungi, Plantae and Animalia. Kingdom Monera includes all the
prokaryotes. Kingdom Protista, Fungi, Plantae and Animalia consists of all eukaryotes. Therefore, among the five kingdoms, all the four kingdoms consist of eukaryotes except Kingdom Monera.