Leo Tolstoy is best known for his ______.

novels

The correct answer is Option (4) - novels

Leo Tolstoy is best known for his novels. He was a prolific Russian writer whose works, including "War and Peace" and "Anna Karenina," are considered some of the greatest literary achievements in history. Tolstoy's novels are renowned for their depth, complexity, and insightful exploration of human nature, society, and morality.