Which of the following is a novel by Ernest Hemingway?

For Whom the Bell Tolls is indeed a novel by Ernest Hemingway, published in 1940. It is set during the Spanish Civil War and follows the story of Robert Jordan, an American dynamiter who is tasked with blowing up a bridge. The novel explores themes of love, sacrifice, and the impact of war on individuals and societies, showcasing Hemingway's characteristic style, which includes concise prose and a focus on the inner lives of his characters.

The other titles listed are not written by Hemingway. Vanity Fair, written by William Makepeace Thackeray, is a satirical novel published in 1847-1848 that critiques British society. Pygmalion is a play by George Bernard Shaw that addresses themes of class and social mobility through the character of Eliza Doolittle. The Grapes of Wrath, authored by John Steinbeck, tells the story of the Joad family during the Great Depression and is recognized for its social commentary on the struggles faced by displaced families. Each of these works is significant in its own right but belongs to different authors and genres than Hemingway's contributions to literature.