The correct answer is: A. 2
A light engine is a type of locomotive that is used for light-duty tasks, such as shunting and switching. It is typically smaller and less powerful than a mainline locomotive, and it does not require a full crew. As a result, only two officers are typically required to operate a light engine: a driver and a fireman.
The driver is responsible for operating the locomotive and ensuring that it is safe to operate. The fireman is responsible for maintaining the fire in the locomotive’s boiler and for providing assistance to the driver as needed.
In some cases, a light engine may be operated by a single person. This is typically done when the engine is being used for short-distance trips or when there is no need for a fireman. However, it is important to note that this is not the standard operating procedure, and it is always best to have two people on board a light engine whenever possible.
Option B is incorrect because a light engine does not require a full crew of three people. Option C is incorrect because a light engine does require at least two officers. Option D is incorrect because there is a correct answer to the question.