The correct answer is: C. 50 kmph.
A tank engine is a type of locomotive that has a water tank mounted on top of the boiler. This type of engine is often used for shunting and switching operations, as it is able to move quickly and easily around a yard.
The speed at which a tank engine can run is determined by a number of factors, including the type of track it is running on, the weight of the train it is pulling, and the weather conditions. In general, tank engines can run at speeds of up to 50 kmph.
If a tank engine is equipped with a cow catcher and head light, it can run at a speed of up to 50 kmph during the night. A cow catcher is a metal bar that is mounted on the front of the engine to protect it from hitting obstacles, and a head light is a light that is mounted on the front of the engine to illuminate the track ahead.
The other options are incorrect. Option A, booked, is not a speed. Option B, sectional, is a type of train schedule. Option D, none of these, is not a valid answer.