How do scrubbers reduce the impact of coal use?

How do scrubbers reduce the impact of coal use?
a.
Scrubbers remove all harmful emissions from smoke before it leaves the plant.
b.
Scrubbers remove nearly all carbon dioxide from smoke of coal power plants.
c.
Scrubbers remove sulfur from the smoke of coal power plants.
d.
Scrubbers remove large particulates from the smoke of coal power plants.

>>THE ANSWER WOULD BE C<<

c.Scrubbers remove sulfur from the smoke of coal power plants.

North carolina ranks second in christmas tree production has nothing to do with biotechnology

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem