Which reason for trade barriers is being used when the us refuses to trade with another country because they use child labor to manufacture goods? national security upholding standards protection of us jobs protection of us markets

answer; i believe that the correct answer is ; the eastern and western churches spoke different languages;

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.