I believe your answer would be c, as marks of punctuation go before quote lines(sorry I can't remember the names of ") Hope this helps!
Answer: The answer would be D
The correct answer is A. During this excerpt you can realize how important it is for the narrator the air, but not just only the air, the things that it involves, and the example is that the air the same for all, there is the social aspect that the narrator wants you to see and to understand the consequences of the things we do affects us all