Which of the following describes the third substage of Jean Piaget's sensorimotor stage of infant development?单项选择题

A

d. An infant repeats an action for the sake of its consequences.

B

b. It is characterized by an infant being completely preoccupied with the self.

C

a. An infant's schemes are intentional and goal-directed.

D

c. It develops between 2 and 4 months of age.

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