The 'distance from the equator' is measured by 'latitude'.
Option: A
Explanation:
Latitudes are the lines which are parallel to the equator, that starts at 0 degrees from equator and ends in the north and south poles with 90 degrees. Latitudes are helpful in measuring the Earth's distance towards south pole or north pole keeping equator as the reference point. So, we say that latitudes are the circular lines rounding the Earth which measures distances of different parts of the planet from the equator.
