Correct Option: D

The best and a highly recognised natural system of classification was proposed by George Bentham and Sir Joseph Hooker, two great British botanists associated with Royal Botanical Garden at Kew, in their General Plantarum (1862-1883). They classi fied plants strictly on the basis of a natural scheme. This system is based not only on the characters of the reproductive organs and structural relationship, but all the other important characters are also taken into consideration and the plants are classified according to their related characters.