The correct options are
A It eliminated other European powers from ever colonising the Americas.
C The English wanted to carry out trade with the Americas without hindrance.
By the time revolutions had begun in Latin America opposing colonialism, the USA was asserting the rights and interests of its own citizens. It was in such a time that the then U.S. President James Monroe, put forth the Monroe Doctrine. The Monroe Doctrine was a cornerstone of U.S. foreign policy that opposed European colonialism in the Americas
Through this, the U.S. was giving itself allowance to colonise other countries, but the European countries were prohibited from doing so in the Americas. Britain supported the Monroe Doctrine as it didn’t want other European countries to colonize America. They also wanted to carry on their trade with the Americas without any hindrance.