How many Famous Five books did Enid Blyton write?

Enid Blyton wrote a total of 21 Famous Five books, making this the correct answer. The Famous Five series is one of her most popular works and features a group of children and their dog who embark on various adventures. Blyton's storytelling captures the essence of friendship, exploration, and problem-solving, which has contributed to the enduring popularity of the series. The series began with "Five on a Treasure Island" published in 1942 and concluded with "Five Are Together Again" in 1963, solidifying Blyton's legacy as a beloved children's author. The specific number highlights the extensive nature of the series while also indicating that it is finite, unlike some other ongoing series, helping readers understand Blyton's contribution to children's literature.