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!
The best answer B) Don't skip school and tell his girlfriend he can't attend
cuz if he skips school that would make it look bad on him for not attending to school and should also tell his girlfriend because it might ruin there realastionship they have
The correct answer is A.<span>can help leaders decide how to plan for the future</span>
