What does this statement tell you about Grendel, the first monster described in the selection from Beowulf?

The statement "The monster's thoughts were as quick as his greed or his claws" suggests that Grendel possesses intelligence and cleverness. The comparison of his thoughts to his greed and claws implies that he is not only physically dangerous but also mentally agile. Therefore, the correct answer is:

D. He has intelligence and cleverness.