Answer:
The correct answer is B. The senator that cast the deciding vote for the acquittal in the impeachment trial of Andrew Johnson was Edmund Ross.
Explanation:
Edmund G. Ross was an American politician that represented Kansas in the Senate from 1866 to 1871, and was appointed governor of the New Mexico Territory from 1885 to 1889.
He voted against the dismissal of President Andrew Johnson, allowing him to remain in office with a majority of one vote. This act, motivated by the desire to maintain the independence of the executive power in relation to that of Congress, has earned him the opprobrium both within his State and through all the country.
