When Teresa's mother hides her favourite doll under a blanket,Teresa acts as if it no longer exists,and she makes no attempt to look for it.Which of Piaget's stages can you infer that Teresa is in,based on this information

A)  sensorimotor 
B)  formal operational 
C)  preoperational 
D)  concrete operational

Teresa's behavior reflects the sensorimotor stage of Piaget's theory of cognitive development, which spans from birth to about 2 years of age. During this stage, children do not yet understand object permanence, the understanding that objects continue to exist even when they cannot be seen, heard, or touched. Teresa's lack of search for the hidden doll suggests she has not yet developed object permanence.