Which of the following could explain the relatively high wages camed by certain medical professionals, Ike nurse practitioners and physicians?

A. The training and certifications required for these professions lead to a relatively high quantity of labor
supplied at any given wage

B. The age of our population leads to a relatively high quantity of labor supplied at any given wage.

C. The age of our population leads to a relatively low quantity of labor demanded at any given wage.

D. The training and certification required for these professions lead to a relatively low quantity of labor supplied
at any give wage