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!
OK so I believe the answer will be B. because they never really give you all the information but they will give you the core info.
Transportation laws <span>promoting safety precautions, such as the helmet law, lead to an increase in public health. Legislation on speed limits, drunk driving are a few of the most obvious examples. </span><span> Wearing a helmet, without question, reduces a rider's risk of injury. However, </span><span>Public education and </span>infrastructure upgrades<span>, protect riders considerably even before helmets come into the scene. </span>
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