Cairo in the adventures of Huckleberry Finn is where the Ohio meets the Mississippi River.
I think the answer is C because it’s the only one that attests to what Mr.Kops has done
Details and pertinent points. It describes the features, aspects, and qualities of something.
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.