The correct option is C Numerical Taxonomy
One of the best methods for understanding general relationships of plants is Numerical Taxonomy or classification based on the number of organs in plant parts. Cytotaxonomy is the classification of organisms based on cellular structure and function, especially the structure and number of chromosomes. Experimental taxonomy involves the application of cytological, ecological and genetic techniques in the classification of organisms. Chemotaxonomy is the classification of organisms based on biochemical composition.