D) John Quincy Adams
One of the biggest accomplishments of John Quincy Adams as Secretary of State (1817-1825) under the President James Monroe was to advise and help write the Monroe Doctrine (1823), a United States policy stating U.S. protection over the Western Hemisphere, warning European nations that any effort to take control over any of these independent states, would be seen as an unfriendly position toward the U.S.
The following year, John Quincy Adams served as the 6th President of America from 1825 through 1829.
