Hmmm. i think it is D. but thats just my opinion <span />
B. Examples
The answer is B because when using examples it boosts your opinion because you may be using facts or something to back up your idea or such.
Exp: I think brainly is a good place to place opinions because for example someone else may come along and comment on your answer with better options or facts.
that this is the affect of tone, and mood in this passage.