Which of the following novels is set in the Victorian era?

The Picture of Dorian Gray, written by Oscar Wilde and published in 1890, is distinctly set in the Victorian era, which is generally characterized by the period of Queen Victoria's reign from 1837 to 1901. This novel reflects the moral and aesthetic concerns of the time, exploring themes of beauty, decadence, and the conflict between aestheticism and morality, all of which were significant cultural discussions during the Victorian period.

In contrast, the other novels listed belong to different literary movements and time periods. 1984, written by George Orwell and published in 1949, is a dystopian novel often viewed in the context of post-World War II political concerns. The Great Gatsby by F. Scott Fitzgerald, published in 1925, captures the essence of the Jazz Age in America during the 1920s, while The Catcher in the Rye by J.D. Salinger, published in 1951, focuses on post-war American youth culture. Each of these works addresses themes and social issues relevant to their own respective times, rather than the Victorian context reflected in Wilde's novel.