The primary energy source in the united states is:
a. solar energy
b. nuclear power
c. fossil fuel
d. hydroelectric power

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

c

explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long