What genre is Robert Louis Stevenson primarily known for?

Robert Louis Stevenson is primarily known for his contributions to children's adventure novels, particularly exemplified by his iconic works such as "Treasure Island" and "Kidnapped." These novels capture the essence of adventure and exploration, engaging young readers with tales of piracy, treasure hunting, and heroic characters. Stevenson's ability to blend thrilling plots with vivid descriptions and relatable characters has established him as a key figure in this genre.

While he did delve into various literary styles throughout his career, including elements of horror and even psychological aspects in works like "Strange Case of Dr Jekyll and Mr Hyde," his most enduring legacy lies in his adventure stories that have captivated audiences of all ages, particularly children. This focus differentiates him from the other genres listed in the options, which do not encompass the essence of his most well-known works.