Which one of the following is the most important basis of the Whittlesey's classification of agriculture of the world?
(a) Functioning forms of agriculture
(b) Distribution of climatic elements
(c) Forms of livestock grazing activities
(d) Regional distribution of the principal crops and animals of commercial significance.

Options

A. Functioning forms of agriculture
B. Distribution of climatic elements
C. Forms of livestock grazing activities
D. Regional distribution of the principal crops and animals of commercial significance.

Answer

D