Some of the politicians who strongly supported free trade among Canada, the United States, and Mexico are now refusing to support publicly the idea that free trade should be extended to other Latin American countries. If the statement above is true, which one of the following must also be true? ['Not all politicians who now publicly support extending free trade to other Latin American countries strongly supported free trade among Canada, the United States, and Mexico.', 'Some of the politicians who strongly supported free trade among Canada, the United States, and Mexico now publicly oppose extending free trade to other Latin American countries.', 'Some of the politicians who now publicly support extending free trade to other Latin American countries did not support free trade among Canada, the United States, and Mexico.', 'Not all politicians who strongly supported free trade among Canada, the United States, and Mexico now publicly support extending free trade to other Latin American countries.']