Economist: Some people argue that when large countries split into several small countries, the world economy is harmed by increased barriers to free trade in the form of an increased number of national tariffs. But small countries do not think of themselves as economically self-sufficient. Ttherefore, such division of large countries does not increase barriers to free trade. Which one of the following, if assumed, enables the economist's conclusion to be properly drawn? ['Large countries tend to be more economically self-sufficient than small countries.', 'A country has the right to split into smaller countries even if some of the economic consequences of division would harm the world economy.', 'All countries that impose national tariffs or other barriers to free trade think of themselves as economically self-sufficient.', 'There is strong evidence that national tariffs and other barriers to free trade harm the world economy.']