I truly believe the correct answer is C
Quotations add emphasis to ideas, so A is out. If quotations add emphasis to ideas then they also add strong support to claims therefore C is out. Quotations add credibility to writing as well so D is out. Therefore B is the right answer, you would not include direct quotations in a story to add length to a boring story.
Tone can be best described as as yelling, screaming, or any kind of noise.
For instence, if I were yelling while watching the Super Bowl, that would be a tone.
Hope my example and answer helps!
Carlos is mostly in conflict with Yoyo. He ripped her speech.