The information given by the lie detector, according to the author, is ______.

A．Language is as useful as music.
B．Painting is the best of all in lifting one's spirits.
C．Not everyone is given the chance of a good future.
D．To see human's bright side is a game of chance.

A．a lie detector can make a good record of nerve impulses
B．a liar benefits himself from lying, but only at the cost of others
C．it is vital for us to be truthful to each other
D．lying will be checked by more advanced lie detectors