The correct answer is "A".
John Loudon McAdam was a Scottish inventor who dedicated his efforts to the improvement of roadways throughout Great Britain. He decided to engage in these efforts after seeing the poor conditions of the roads that were located in his home in Sauhrie. He is credited with the invention of the Macadam road surface, which proposed that roads should be leveled above the adjacent ground in order for them to have good drainage and avoid cracks due to dilatation.
