The correct answer to this open question is the following.
The information that is needed to investigate and describe a region by its geographic characteristics is the following.
What we need to describe a region geographically speaking is to know the weather of the region, the altitude which is the elevation above sea level, land formation, or mountain chains if it has some, the type of soil, and the plants and trees that grow in the region, and the wildlife. We can search for geological characteristics, as well as atmospheric and hydrological means to know more about the geography of the place.
C,Congress could only change the amendments regarding slavery with the unanimous approval from all the states, Congress had the power to do more than just that therefore, it's incorrect.
