A. Correct option- B
B. Explanation for the correct option
Coelenterates are the acoelomate animals that are marine, aquatic, sessile or free-swimming.
Bony fishes belong to class Osteichthyes. These fishes have a cartilaginous endoskeleton in the embryonic stage which is replaced by bones in adult forms.
Mammals are warm-blooded animals that have mammary glands.
Reptiles are the animals that creep on the land.