Answer:
They create a mysterious tone
Explanation
I think the correct answer from the choices listed above is option C. Communication is considered ethical if it is relevant to the topic of discussion. Good communication is the use of the proper words for the given topic. Hope this answers the question.
Your answer is D, "I was not always the very best student that I could be when I was in high school, and certainly not when I was in middle school".
I think it is d. Gerund, because it is a verb that can be a noun
I believe the answer is kindhearted