Answer: B) Yes, the author maintains a formal and authoritative tone.
Explanation: the tone of a sentence or a text is the author's or speaker's attitude towards the audience, the subject or even the characters of the text. There are many different kinds of tones: positive, negative, objective, happy, sad, angry, etc. In the given excerpt we can see that the author maintains a consistent tone, it is always formal and authoritative, so the correct answer is option B.
Answer: punctuation and spelling
Explanation: Those are the two most prominent things grammatically in writing
Mum will not cook mutton tonight.
This is the negative form of this sentence.