Which of the following is NOT one of the four main types of writing?

The correct answer identifies "Comparative" as not being one of the four main types of writing, which typically include descriptive, narrative, expository, and persuasive writing.

Descriptive writing focuses on detailing characteristics and elements of a subject, often aiming to create a vivid picture in the reader's mind. Narrative writing tells a story, often involving characters, a setting, and a plot. Persuasive writing aims to convince the reader of a particular viewpoint or argument, using evidence and emotional appeals.

While comparative writing involves examining the similarities and/or differences between two or more subjects, it is more of a technique used within the other types rather than a standalone category of writing like the others. Thus, it does not belong in the traditional classification of the four main types of writing.