Which of the following measurements us determine distance from the prime meridian?
a. longitude
b. latitude
c. altitude
d. elevation

Longitude helps us  to determine the distance from the Prime Meridian.

Option A

Explanation:

Longitudes run from east to west. These lines are measured with the help of the imaginary lines which run on the surface of Earth from north pole to the south pole and run vertically from upwards to down wards.

These lines are known as the Meridians. These meridians are responsible for measuring each decree of all the longitudes which run on the surface of earth horizontally from east direction to west direction. Thus longitudes specify a position on the surface of Earth either on the east or on the west direction.