What type of writing presents a position supported by defined reasons?

The correct answer is rooted in the definition and purpose of argumentative writing. This type of writing aims to convince the reader of a particular viewpoint by presenting a clear position supported by logical reasoning, evidence, and sometimes emotional appeals. It often addresses counterarguments, which helps to strengthen the writer's stance by refuting opposing views.

While persuasive writing can also aim to convince the reader, it is often broader and might incorporate more emotional or rhetorical strategies without necessarily relying on structured evidence. Informative/explanatory writing, on the other hand, focuses on providing information or explaining a concept without taking a position. Descriptive writing is primarily about creating vivid imagery and sensory experiences rather than supporting a specific viewpoint. Thus, argumentative writing aligns most closely with the requirement of presenting a defined position supported by reasons.