From the article we eau infer that we are influenced by customs ______.

A．custom plays an important role in shaping the behavior of an individual
B．the behavior of an individual is not influenced by customs
C．the words of one's baby talk take a great proportion in the vocabulary of one's mother tongue
D．all the vocabulary of one's mother tongue originates from one's baby talk

A．our concepts of the true and the false are influenced by our traditional customs
B．we always look at the world with pristine eyes
C．philosophers try to explain stereotypes
D．traditional customs are more important than philosophies