1. People who are near smokers breathe in air a. that is clean because secondhand smoke is harmless
b. that contains only carbon dioxide and oxygen
c. that contains nicotine and carbon dioxide

C.That contains nicotine and carbon dioxide

Explanation:

Because since a cigarette has nicotine and it turns to carbon dioxide and nicotine because, if it was clean air it wouldn't have a smell to it either or carbon dioxide.

At least I think that what it is because I live with a smoker.

yes, it is pretty much the same thing, which is cool. : )

answer; i believe the correct answer is ( mediation);