Over the past two decades, a wide gap in pay has arisen between medical professionals who practice in the public health arena as opposed to those who practice privately. As a result, many doctors, nurses and other health professionals employed by public and nonprofit agencies have left their public health jobs in favor of private clinics and hospitals. Public and nonprofit agencies will be able to entice these professionals to return to public health jobs if salaries are made commensurate with those paid in the private sector. The quality of medical care provided by public and nonprofit agencies will thus be improved.

Which one of the following is presumed in the position stated above?

(A) The experience obtained by medical professionals in private clinics and hospitals will be especially important in the public health arena.
(B) How well public and nonprofit health agencies perform depends for the most part upon the experience level of their health professionals.
(C) Unless public and nonprofit health agencies act, the salaries paid to medical professionals in private practice will continue to outpace those paid in the public health arena.
(D) Medical health professionals who moved from the public sector to the private sector would change jobs again.
(E) If the pay disparity between the public and private medical sectors continues to increase, many doctors and nurses will move from private practice to the public health area.