Answer: D) Tone.
Explanation: The tone of a poem, a story or even a sentence is the attitude of the text (the author's or speaker's attitude) towards the subject, theme, audience or even the characters. There are many differents kinds of tones: happy, sad, angry, positive, negative, objective, subjective, etc. According to that definition, the correct answer is the corresponding to option D.
Ik that light is faster than sound .