The tetrapods include:

A) fish, amphibians, reptiles, and mammals.
B) lancelets, cartilaginous, and bony fish.
C) amphibians and reptiles.
D) amphibians, reptiles, birds, and mammals.
E) echinoderms and chordates.

Tetrapods are a superclass of animals that includes four-limbed vertebrates. This group comprises amphibians, reptiles, birds, and mammals, which all share the common characteristic of having four limbs or being descended from four-limbed ancestors.