The correct answer is "eggs, larvae, adult". Cestodes are a type of parasitic flatworms, commonly known as tapeworms. They have a complex life cycle that involves different stages. The eggs are released into the environment through the feces of the adult tapeworm. These eggs are then ingested by an intermediate host, such as a flea or a small vertebrate. Inside the intermediate host, the eggs hatch into larvae, which develop into cysts. When the intermediate host is consumed by a definitive host, such as a human or an animal, the cysts release the larvae, which then develop into adult tapeworms in the intestines. Therefore, the correct order of stages in the life cycle of cestodes is eggs, larvae, and adult.