Final answer:
Samuel Clemens, who wrote under the pen name Mark Twain, is the author of 'The Adventures of Huckleberry Finn', a landmark work in American literature and Literary Realism.
Step-by-step explanation:
The author of 'The Adventures of Huckleberry Finn' is Samuel Clemens, who is better known by his pen name, Mark Twain.
The Adventures of Huckleberry Finn is often referred to as the "Great American Novel" and is a prominent example of the Literary Realism movement. Mark Twain, born Samuel Langhorne Clemens, is celebrated for his storytelling and humor, and his writings reflect his experiences growing up along the Mississippi River. Despite being published under his pen name, any literary exploration of Twain's works directly links back to Clemens as the mastermind behind the enduring classics. Twain's other notable works include The Adventure of Tom Sawyer, Roughing It!, Innocents Abroad, and A Connecticut Yankee in King Arthur's Court. His humorous style, use of regional dialect, and incisive social commentary have secured his legacy as a pivotal figure in American literature.
Neither William Dean Howells nor Henry James penned this novel, though they were contemporaries of Mark Twain and also major figures in the American Literary Realism movement. Each of these authors made significant contributions to literature and Realism, with Howells known as the "Dean of American Letters" and James recognized for his psychological Realist works and influence on narrative techniques.