The best answer to how Sinclair Lewis differed from other Lost Generation authors like F. Scott Fitzgerald and Ernest Hemingway would be:
D. • Lewis' writing was influenced more by the previous generation's progressive ideas.
Sinclair Lewis's work often critiqued American society and its values, reflecting progressive ideas and social criticism, while Fitzgerald and Hemingway were more focused on themes of disillusionment, the effects of war, and the complexities of modern life, often from a more personal or existential perspective.
Regarding the other options:
A. Lewis was indeed commercially successful and received the Nobel Prize in Literature in 1930, which makes this statement inaccurate.
B. Lewis did not choose to permanently live as an expatriate; instead, he often critiqued American society from within.
C. Lewis did not come from a wealthy socialite family; he had a middle-class background, differentiating him from some of his contemporaries.
Thus, option D is the most accurate reflection of Lewis's literary stance among the mentioned authors.