The Medical Field Requires Doctors to Pass Exams in Order

The medical field requires doctors to pass exams in order to earn a license to practice medicine.This requirement ________ doctors' salaries because ________.

A) increases; the supply of doctors decreases and fewer doctors are employed
B) increases; the supply of doctors increases and as a result they are better trained
C) increases; the demand for doctors decreases because they charge higher prices
D) decreases; the supply of doctors decreases due to the tougher requirements
E) decreases; fewer people go to doctors because of the high prices