Answer:
A globe
Explanation:
When we use a globe we can very accurately represent the Earth, its curvature, and with a good scale and coordinate system for the geography. This can be done on a map to an extent but in order for us to put a spherical body on a flat surface, we need to make some changes. This is why on maps you see some parts of continents as larger than they really are.
The Arabian Desert, Gobi Desert
and the Karakum Desert
I believe a=128/15
I hope this helped a bit~
the answer is C because through common sense it makes sense.