The job was finished at last, and he threw himself down behind a fallen log a hundred feet away. He did not have to wait long. The cat was coming again to play with the mouse. Following the trail with the sureness of a bloodhound came General Zaroff. Nothing escaped those searching black eyes, no crushed blade of grass, no bent twig, no mark, no matter how faint, in the moss.

Which theme is supported by the sentences above?

A. Animals are evolving to become more like people.

B. Animals and human beings are different from one another

C. Human beings are not driven by reason

D. Human beings are driven by the same instincts as animals.