The correct answer is D. None of these.
The consumption of fuel during idle run per hour varies depending on the type of car, the engine size, and the driving conditions. In general, a car will consume about 0.5-1 liters of fuel per hour while idling. However, this number can be higher or lower depending on the factors mentioned above.
For example, a small car with a 1.0-liter engine will consume less fuel than a large car with a 3.0-liter engine. Additionally, a car that is idling in stop-and-go traffic will consume more fuel than a car that is idling on the highway.
It is important to note that idling your car for extended periods of time can be harmful to your engine. If you need to stop your car for more than a few minutes, it is best to turn it off.