Final answer:
The literary work that is not a novella among the options is 'The Great Gatsby,' which is a full-length novel. 'Babbitt' by Sinclair Lewis is a novel that satirizes the conformity of the American middle class.
Step-by-step explanation:
The question pertains to a comparison of literary works and understanding what constitutes a novella. Among the provided options, 'The Great Gatsby' is not a novella; it is a full-length novel. It was written by F. Scott Fitzgerald and published in 1925, and it is well known for its exploration of themes like the American Dream and social stratification. In contrast to a novella, which is typically shorter than a novel but longer than a short story, 'The Great Gatsby' is a full-fledged novel with a complex narrative structure and a depth of character development that requires a broader scope than a novella.
Regarding the novel that satirized the conformity of the American middle class, the answer is 'Babbitt' by Sinclair Lewis. This novel was published in 1922 and is famous for its portrayal of the protagonist, George F. Babbitt, whose name became synonymous with middle-class conformism and materialism.