The author focuses on how Jewett’s work is classified. She doesn’t redefine entire historical categories of literary style.

The author focuses on Jewett’s work and how it relates to the domestic novelists’. But the author doesn’t explore Jewett’s work as an example of a particular style. In other words, the focus of the passage is on Jewett, not on a style of writing.

The primary purpose concerns Jewett’s work. The author doesn’t focus on the historical connections between a group of writers. Although the overall point relates to the relationship between Jewett’s work and the domestic novelists’, this passage is primarily focused on Jewett, not on a group of writers.

The primary purpose concerns Jewett’s work, not on differing conceptions of fiction. Although differing conceptions of fiction are relevant to how we assess Jewett’s work, the primary purpose of the passage is still on her work and not on conceptions of fiction.

This is the best answer. The author rejects the critics’ way of classifying Jewett’s work (as aligned with domestic novelists’ work). In addition, the author defends an alternative view — the view that Jewett’s work is more aligned with the conception of fiction as pure art.