6. _______________ When they are unhappy, they moan and groan. When they want to pick a fight,they bark. When night falls, they use a special howl to call each other together for the hunt.When dawn breaks, a different howl tells the pack that it is time to return to their den. Andanother howl says to the pack, “Danger ahead!” With their keen sense of hearing, the gray wolfcan hear a howl for help almost four miles away.
(A) Gray wolves like the company of other wolves.
(B) Gray wolves use different sounds to communicate.
(C) Gray wolves are nature’s best predators.
(D) Gray wolves are the noisiest of all mammals.¯