Which of the following is a correct statement about the major cities of the world?
(A) Most are located on rivers or seacoasts.
(B) Most are found in areas that are not very suitable for agriculture.
(C) Most primate cities are located in the United States and western Europe.
(D) They are concentrated between the tropic of Cancer and the tropic of Capricorn.
(E) The world's fastest growing cities are found in areas with the highest standards of living.