The correct answer is: A. Stagnation of water on road.
Tar roads are made of a mixture of tar and aggregate. When water stagnates on a tar road, it can cause the tar to break down and the aggregate to separate. This can lead to potholes, cracks, and other damage to the road.
Heavy traffic can also damage tar roads, but it is not as likely to cause the same type of damage as stagnation of water. Heavy traffic can cause the road to wear down and become rough, but it is not likely to cause the tar to break down or the aggregate to separate.
No maintenance can also damage tar roads, but it is not as likely to cause the same type of damage as stagnation of water or heavy traffic. No maintenance can
cause the road to become overgrown with weeds and debris, which can make it difficult to drive on and can also lead to potholes and cracks.No sloping is not likely to damage tar roads. Sloping is the process of grading
a road so that water flows away from the center of the road. This helps to prevent water from stagnating on the road and causing damage.In conclusion, the correct answer is: A. Stagnation of water on road.