Which aspect refers to the manner in which a writer uses language in prose or poetry?

The correct answer is style, as it specifically refers to the way a writer expresses their thoughts through language, including their choice of words, sentence structure, figurative language, and overall tone. Style encompasses the unique voice of the writer, influencing how the content is perceived by the reader. For example, a writer may have a formal style that uses complex sentences and sophisticated vocabulary, or a conversational style that employs simpler language and a friendly tone.

Understanding style allows readers to appreciate the nuances of a piece, such as the mood it creates and the emotions it evokes. In literature, distinguishing between different styles can also help identify the characteristics of various genres and movements, leading to a deeper comprehension of the work.