Final answer:
In the book 'Percy Jackson & the Olympians: The Sea of Monsters' by Rick Riordan, Percy escapes from Circe's Island with the help of Clarisse.
Step-by-step explanation:
The correct answer is b) Clarisse. In the book 'Percy Jackson & the Olympians: The Sea of Monsters' by Rick Riordan, Percy escapes from Circe's Island with the help of Clarisse. Circe is a sorceress who turns Percy's friends into animals, and Clarisse, the daughter of Ares, rescues Percy and his friends. This escape is a crucial event in the story as it allows Percy to continue his quest.