One Reason Why Most Economists Forecast That the Effects of NAFTA

One reason why most economists forecast that the effects of NAFTA on the U.S.economy would be small is because

A) NAFTA does not bring down tariffs far enough.
B) the Mexican economy is small relative to the U.S.economy.
C) NAFTA trade opening provisions only cover a handful of sectors.
D) Mexico was not expected to live up to its obligations under the agreement.
E) the United States was not expected to live up to its obligations under the agreement.