According to piaget, infants in the sensorimotor stage of development learn to master the realization that people and objects exist even when they cannot be seen.

a) tertiary circular reactions
b) object permanence
c) accommodation
d) simple reflexes

B) Object permanence                                

Explanation:  

Object permanence: In psychology, the term object permanence occurs in the sensorimotor stage of the theory of cognitive development that was proposed by the famous psychologist named Jean Piaget.

According to Jean Piaget, the term object permanence is defined as a child's understanding that a particular object still exists even if that object is not being perceived, for example, heard, seen, smelled, etc.

In the question above, the given statement signifies the importance of object permanence.

credit card number 4 is the right answer

can you explain a little further maybe give multiple choice? ?