Because your request “Which tone” is very open-ended, it could refer to a few different concepts depending on your context.
The three most common definitions of tone are literary tone (writing attitude), linguistic tone (vocal pitch), and color/skin tone (visual shades). 1. Tone in Writing and Literature
In communication, tone refers to the author’s attitude toward the subject matter or the audience. It is conveyed entirely through word choice (diction), sentence structure (syntax), and formality. Tone-of-Voice Words – NN/G