What links cognitive development to the needs of society

A．Parents and teachers play a key role in his development of cognition.
B．He believes that objects around him independent of his perception.
C．Strong motivations give rise to perception which is polished further by the child itself.
D．He holds the conviction that things around him are parts of extended body and later on gives it up.

A．face them bravely and try to overcome them.
B．neglect them and come up with a new goal.
C．be unwilling to admit there are some difficulties.
D．worry about them and feel discouraged or frustrated.