Why is poe's selection of the expository-essay selection for his work "the philosophy of composition"

Poe wants to explain the writer’s process to an outside observer. Selecting nonfiction, specifically the expository essay, is appropriate because expository essays examine a topic in an organized way. The expository essay makes use of logical examples and explanations to support an idea, which is well suited to Poe’s purpose.

the rhetorical devices that he used in "common sense" are syntax for his sentence structure and pathos for his emotion against the british unfairly treating the "americans" and logos of what documents that what happened to the pilgrims when they had the mayflower compact and how that the british were wanting to have one religion but the compact said for any religion to be accepted.

b is the answer for this question.