Mark the statement if it correctly describes human interaction with the environment.
a.
since ancient times, people have used waterways for transportation.
b.
when natural waterways are too difficult to navigate, people sometimes dig canals to provide a better means of transportation.
c.
very few groups of people have found ways to use rough or rapid rivers for transportation or irrigation.
d.
canals are man-made waterways that change the natural landscape to meet human needs.