The Use of Trade Barriers to Enforce Standards Abroad Raises

The use of trade barriers to enforce standards abroad raises all of the following concerns except

A) the potential deadweight losses in consumption and production at home.
B) the potential for the use of trade barriers to erupt into a bigger trade war.
C) the difficulty of knowing whether some of the concerns are over standards or are veiled protectionism.
D) only small countries may be able to use trade barriers effectively.