This stage is important because it is almost election time; (who will be 'chosen' / elected to become The (next) President of The United States Of America, to be in The White House.)
Answer:
C. to provide a history of African American surgeons
C. How long does it take to travel from the Earth to the moon?
This is the weakest research question because it can be easily answered. According to a 2 second Google search, it takes about 3 days for a spacecraft to reach the moon from Earth. This question does not allow for a lot of research for development into an essay. Options A, B and D all have a variety of possibilities that would allow for a multi-paragraph essay with significant topic development.