All I have to say is operation Unthinkable
US president Thomas Jefferson recognized that the revolution had the potential to cause an upheaval against slavery in the US not only by slaves, but by white abolitionists as well. Southern slaveholders feared the revolt might spread from the island of Hispaniola to their own plantations.
If there isn't a fourth choice then i believe the correct answer would be "b" a governor cause a president has authority over everything and a mayor is mostly pinned to a town or city.
hope this helps and is what your looking for.<3
have A GREAT DAY