In the mercantilist economics system , who benefits the most ?

According to google, Mercantilism, an economic policy designed to increase a nation's wealth through exports, thrived in Great Britain between the 16th and 18th centuries. Between 1640-1660, Great Britain enjoyed the greatest benefits of mercantilism.

the answer wold be b) travel among nations should be regulated by an international organization

answer; i believe that the correct answer is (c) arctic tundra;