The physical distance covered by a vehicle is measured in terms of ________.

The correct answer is D. running kilometers or miles.

• Ton kilometers is a measure of the total weight of the goods transported by a vehicle over a distance.
• Passenger kilometers is a measure of the total number of passengers transported by a vehicle over a distance.
• Vehicle days is a measure of the total number of days that a vehicle is in operation.
• Running kilometers or miles is a measure of the total distance that a vehicle travels.

Running kilometers or miles is the most common measure of the physical distance covered by a vehicle. It is used to calculate the fuel consumption, maintenance costs, and depreciation of a vehicle. It is also used to track the progress of a vehicle in a race or rally.