The correct option is
C Amphibia
Ichthyophis belongs to Amphibia. Ichthyophis is a genus of Caecilians. Amphibians are cold-blooded vertebrates. They have a backbone, and they maintain their body temperature through external means, such as laying in the sun. Amphibians spend part of their lives on water and part of their lives on land. They have permeable skin, which gasses and some molecules penetrate, they also have gills for some portion of their lives.