C it resolves the main conflict of the story
Answer: description
Explanation: your describing whatever your trying to explain (im right i'm in honors so you don't have to worry XD )
I don't believe that any of these are run-on sentences. This is because they all possess some form of punctuation, which creates a small to moderate oause in the sentence, allowing for the person reading to breathe in between, and preventing a run-on sentence.
it leaves a stronger impact, a stronger word draws attention. it makes it more prominent. so a. (sorry if im wrong)