Question

Which answer best describes John McAdam's role in the history of transportation in America?

Answer 1

it is b: McAdam invented a method to build stone roads.

hope this helps!

Answer 2

The best answer to describe John McAdam's role in the history of transportation in America is : McAdam invented a method to build stone roads. 
Back then, the method is called 'Mcadamisation' , using various of mixed materials to build a smooth hard surfaces