Q: You are presented with the quiz "What is an example of a tetrapod vertebrate?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "reptiles are a class of tetrapod vertebrates that produce amniotic eggs" and "crocodiles, snakes, and lizards are all types of reptiles". So, what's the best answer to the question?

Available options: A). genus; B). Leeuwenhoek; C). a fish; D). crocodile; E). animals; F). four limbs; G). warm-blooded; H). graptolites;
The answer is:
D).