which statement best describes the intended purpose of the immigration and nationality act A) the immigration and nationality act allowed the US president to overrule immigration officials and laws for national security in order to prevent communism B) the immigrant and nationality act ended the quota system used since the 1920s and made it easier for refugees and displaces people to emigrate to the US C) the immigration and nationality act continued a quota system that allowed the US president to admit immigrants into he country who would support capitalist policies D) the immigration and nationality act continued a quote system for immigration that supporters felt would prevent communism and other threats from coming into the US