Which of the following people was a freed slave who gave speeches in the north?
a.
ulysses s. grant
c.
frederick douglass
d.
susan b. anthony

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  

answer; /// the above statement is (true);