let's look at all the options:
a. drive their cars more.
-no, this is false.In fact cars increase pollution: so the opposite is true.
b. burn more fossil fuels.
-this is also false, burning fossil fuels are one of the main reasons for our pollution
c. use more public transportation.
-this is true! using more public transportation will make people use less cars, and cars increase pollution.
d. build more factories.
-this is also false, factories contribute to pollution.
