I would have to say the answer is C.
A is incorrect since hydrogen is not an air pollutant.
B is incorrect because ozone is most definitely one of the top.
And D has cyanide which is a chemical for suicide during wars.
Hope this helps!
B. recreational activity's such as walking, throwing, or riding a bike to school
Calories are energies that fuel our bodies. They are found in every single food. For example chips, soda, salad
I need more options I don’t understand the question.
