C or a one of those hope it helps !!!!
The location where the mercury level of the barometer would be the lowest is at the very high altitudes of the Earth's atmosphere (about 100 km), since air pressure decreases as altitude increases.
The answer is A to B because the distance is rising rapidly as seen by the steep slope segment A to B had
C, to make sure the design works as expected.
A prototype is first, typical model of the said product. Hope this helps!
