The answer is D: word choice and length of sentences. Hope this helps!
"<span>It may be one, none, or multiple of the sources we listed" I would just make that part shorter. Make it something like "It could be any of the sources we listed" instead. It didn't make sense with how you listed them and it seems like you're just trying to add more words to meet the quota. </span>
The answer is short answer response<span />
So that the most important details are read last and therefore are remembered the best, leaving a lasting impression on the reader.