Factors That Have Contributed to the Opioid Epidemic in the United

Factors that have contributed to the opioid epidemic in the United States include all of the following except one. Which is the exception?

A) A strong economy and affluence of Americans
B) Laxed regulatory environment with respect to drugs in the United States
C) Drug companies influence over the U.S. health policy
D) Physicians over prescription of opioids to their patients in the United States