R.H. Whittaker proposed the five kingdom classification in the year 1969. It is the most commonly used classification system. It classifies the organisms into five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia. The classification is performed on the basis of the structure of the cell, body organization, the mode of nutrition, reproduction, and the inter-relationship between organisms.
Thus, the correct answer is option B.