Mesosphere is the layer after stratosphere, which is after troposphere, as seen from Earth in the direction of Space.
It starts at 60 km and ends at 120 km, after which comes the termosphere.
So we're looking for a line that's closest to 100 km, and this is the shortest line, A.
Sweetie we need a picture of the diagram
The answer would be B, because there was more opportunity outside of what was the current U.S. Also Manifest Destiny drove the people to move the desire of what they wanted and what they dream was on the outside of what they currently knew as their own.
