What aspect of writing includes the distinctive manner of expression and tone?

The correct choice highlights "style" as the element of writing that encompasses the unique manner of expression and tone used by the author. Style involves various aspects, such as word choice, sentence structure, figurative language, and the overall voice that reflects the personality or attitude of the writer. This distinctive expression not only conveys information but also evokes emotions and engages readers in a specific way, making it a crucial component of effective writing.

The emphasis on tone within style also allows the writer to convey their attitude toward the subject matter or audience, which can greatly influence how the message is received. Thus, style is essential for ensuring that the writer's intent and personality shine through their work.