Answer: D) Straightforward.
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 word that best describes the tone of the excerpt, is the corresponding to option D: straightforward, because the speaker goes straight to the point and gives the information in a clear and direct way.