The underlined word "precept" (in Paragraph 3 ) probably means______.

A．observe the rules themselves
B．be aware of the marked difference between adults and children
C．forbid things which have no foundation in morality
D．satisfy their children's need

A．encourage them to read before they know the meaning of the words they read
B．not expect too much of them
C．achieve a balance between pushing them too hard and leaving them on their own
D．create as many learning opportunities as possible