Explanation:

The correct answer is option 'C' - centre of the earth.

Latitude:
Latitude is the angular distance of a point on Earth's surface measured from the center of the Earth. It is the measurement of how far north or south a location is from the equator. Latitude is measured in degrees, minutes, and seconds, with the equator being 0 degrees and the poles being 90 degrees north or south.

Equator:
The equator is an imaginary line that encircles the Earth halfway between the North and South poles. It is the starting point for measuring latitude. The equator has a latitude of 0 degrees, and locations north of the equator have positive latitudes, while locations south of the equator have negative latitudes.

Prime Meridian:
The prime meridian is an imaginary line that runs from the North Pole to the South Pole, passing through Greenwich, England. It is the starting point for measuring longitude, not latitude. The prime meridian has a longitude of 0 degrees, and locations to the east of the prime meridian have positive longitudes, while locations to the west have negative longitudes.

Center of the Earth:
The center of the Earth is the point at the very core of the planet. Latitude is measured from the center of the Earth because it represents the angle between a point on the Earth's surface and the center of the Earth. This allows for a consistent and accurate measurement of latitude regardless of the location on the Earth's surface.

Poles:
The poles are the points on the Earth's surface where the planet's axis of rotation intersects the surface. The North Pole is located at 90 degrees north latitude, while the South Pole is located at 90 degrees south latitude. These points represent the maximum angular distance from the equator, and they are also used as reference points for measuring latitude.

In summary, latitude is the angular distance of a point on Earth's surface measured from the center of the Earth. It represents how far north or south a location is from the equator, and it is measured in degrees. The equator is the starting point for measuring latitude, but the measurement itself is based on the distance from the center of the Earth. Therefore, the correct answer is option 'C' - center of the Earth.