The correct answer is: A. Day and Night.
Motor trolleys are electric vehicles that run on tracks. They are often used in cities to transport people and goods. Motor trolleys can follow another motor trolley during the day and night. This is because they are equipped with headlights that allow them to see in the dark. Additionally, motor trolleys are typically operated by a driver who is trained to follow other vehicles safely.
Option B is incorrect because motor trolleys can also be used at night. Option C is incorrect because motor trolleys can be used in all weather conditions. Option D is incorrect because motor trolleys can follow another motor trolley during the day and night.