Final answer:
The Lost Generation of the 1920s includes F. Scott Fitzgerald, Ernest Hemingway, and Gertrude Stein, with their works reflecting the era's disillusionment and portraying various aspects of society.
Step-by-step explanation:
The authors most closely associated with the Lost Generation of writers in the 1920s are indeed F. Scott Fitzgerald, Ernest Hemingway, and Gertrude Stein, making the correct answer D. All of the above. These writers expressed their disillusionment with post-World War I society by creating works that often critiqued the middle class and depicted a sense of alienation. For instance, F. Scott Fitzgerald's 'The Great Gatsby' is considered a profound social commentary on the excesses of the era. Likewise, Ernest Hemingway and other writers like Sinclair Lewis and Edith Wharton similarly contributed to the Lost Generation's portrayal of the modern condition, either through their own writings or by encouraging a departure from traditional norms. Many of these writers chose an expatriate life, residing in European cities such as Paris, Rome, or Berlin during the 1920s.