Building the National Road • Trees, stumps, brush, and rock were removed.
• Hills were leveled, and hollows were filled.
Layers of stone were laid in graduated sizes.
• Drainage ditches were dug.
.
Which of the following was the most direct result of the environmental modifications
Ested above?

a)federal regulations were adopted to ensure safety and ease of travel on the road

b)sate government cooperated closely to maintain road quality

c)improved transportation to western states expanded trade and settlement

d)road construction became a major industry in the united states