Which substage of sensorimotor development serves as a transition to the symbolic thought of the next stage?

A) Tertiary circular reaction
B) Secondary circular reaction
C) Invention of new means through mental combinations
D) Coordination of secondary schemes

In the context of Maslow's hierarchy of needs,which of the following is true of lower needs?

A) They are stronger than the higher needs.
B) They are called deficiency needs.
C) Failure to satisfy lower needs produces a crisis.
D) All of these are correct.