【单选题】

Which of the following statements could fully express the author's view towards physicians' payment in the USA'
A．Physicians' expensive education and the characteristics of their work make them well deserve the handsome pay.

B．It is reasonable for physicians to have a large income because their work is very dangerous.
C．Physicians should be better paid because they work long hours under bad conditions.
D．Physicians shoulder great responsibilities, so it is understandable that they should be well rewarded.