Answer:
C
Explanation:
Okay, so I'm just going to go with a ruling-out method, I hope you don't mind-
It isn't A because all it does is add a comma and we're looking for interest
It isn't B, because in the first sentence (Dustin fell out of bed. He hit his head on the night stand), it goes in a sequence. He fell out of bed and then he hit his head on the night stand. But B isn't in sequence.
It's not D because, again, it shows no interest, plus you don't need it to be two sentences.
I hope this helps, I know I didn't explain it well, so sorry about that :)
