The correct answer is D. All the above.
A nautical mile is a unit of length used in navigation. It is defined as one minute of arc of a great circle of the Earth, which is the distance that a ship travels in one minute of time at a speed of one nautical mile per hour. This is equivalent to 1.852 kilometers or 6,076.115 feet.
A nautical mile is also equal to one minute of arc of the longitude, which is the distance from the equator to a point on the Earth’s surface measured along a line of longitude. This is because the Earth is a sphere, and all great circles on a sphere have the same circumference.
Therefore, a nautical mile is both one minute arc of the great circle passing through two points and one minute arc of the longitude.