The correct option is B R.H. Whittaker
Robert Whittaker proposed the five kingdom classification based on the cell type, body organisation, presence of cell wall and nutrition. The five Kingdoms are Monera, Protista, Fungi, Plantae and Animalia.
Aristotle proposed the two kingdom classification.
Carolus Linnaeus is the father of taxonomy.
T. O. Deiner discovered viroids, which are infectious nucleic acid particles.