Suppose Canada Imposed More Stringent Quality Standards on Pharmaceutical Products

Suppose Canada imposed more stringent quality standards on pharmaceutical products being imported from Mexico than were imposed on firms producing the same products in Canada.This action would be

A) a violation of NAFTA's principle of national treatment.
B) a violation of Canadian Competition Bureau rules.
C) an example of a countervailing duty.
D) an example of an unfair subsidy to domestic firms.
E) a breach of WTO trade guidelines.