Read the sentence below: we must stay cool when we talk to the press about the recent mess. which revision of this sentence changes the tone to a more serious one? a. keep in mind that not everything that comes into your head should be spoken to the press. b. keep your mouths shut when the press comes around. c. we have to keep quiet until we know what to say to the press. d. we should carefully consider what to say when questioned by the press.

D) We should carefully consider what to say when questioned by the press.

Explanation: The tone of a text or sentence 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, like: positive, negative, objective, sad, angry, etc. From the given options, the revision that would change the tone of the given sentence to a more serious one, is the corresponding to option D, because of the formal and serious choice of words.

its repetition emphasizing that the chain is his own. sorry if i am wrong.

appeal to ethos is your answer.