Question

Over the past few years, human use of coal has decreased in the United States. What has caused this effect on coal use?

A.
lower costs of other fossil fuels
 
B.
not including environmental costs in pricing
 
C.
relaxed regulations for air pollution
 
D.
falling prices for coal

Answer 1

B maybe hopefully it’s B

Answer 2

It would be .A. Because you arent useing coal as much so other thing can be cheaper