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.
The answer is handwriting
hope so this helped
Referring to a particular type of population in a country or area, you are referring to all the people or animals of that type there.