The correct answer is: A. 15 kmph
A lorry is a heavy truck that is used to transport goods. The speed limit for lorries in most countries is 15 kmph. This is because lorries are large and heavy, and they can cause a lot of damage if they are involved in an accident. It is important to obey the speed limit when driving a lorry, as this will help to keep you and others safe on the road.
Option B: 10 kmph is too slow for a lorry. Lorry drivers need to be able to travel at a reasonable speed in order to make their deliveries on time.
Option C: 20 kmph is too fast for a lorry. If a lorry is travelling at 20 kmph, it will be difficult for the driver to control the vehicle, and there is a risk of an accident.
Option D: None of these is not the correct answer. The speed limit for lorries is 15 kmph.