D). It highlights the contrast between the Dursley’s excitement for the dinner and Harry’s loneliness.
Explanation:
Repetition is elucidated as one of the most commonly employed literary devices in which the author <u>repeats a word or phrase in order to emphasize or highlight a specific idea</u>. While 'tone' is described as the <u>author's approach or attitude towards a specific subject matter</u> reflected through the diction and language adopted by the author to convey it.
As per the question, Harry's constant repetition of the phrase 'I’ll be in my bedroom, making no noise and pretending I’m not there' affects the tone of the given passage by highlighting the disparity between the excitement of Dursley and the loneliness of Harry. It <u>shifts the tone from cheerful to serious and emphasizes Harry's isolation due to his family's fear over his special powers</u>. Thus, <u>option D</u> is the correct answer.
"<span>How many times greater is the acidity of hydrochloric acid than vinegar?" is the best option from the list, since this is what the chapter is primarily dealing with. </span>
