Answer: A. Scornful.
Step-by-step explanation: the tone of a text, sentence or story is the author's attitude towards the audience, the subject or even the characters. In the given quotation the word that best describes the tone is "scornful." A scornful person is someone that has absolutely no respect for another person, scorn is a feeling of disdain when encountering something that you view as inferior or even worthless.