A.
There should always be a comma before a quote and that is a sentence so there is a period at the end
It would be d. conjunctions because they help your sentence flow easily.
Rest, because you're usually looking for the word it gives along with repose with the 'and' separating it. I hope that makes sense.
You must walk in the halls, not run, you can get seriously hurt. You can trip and scar up your knees, you can tumble and fall, and hit your behind. hope this helps :)
