Final answer:
Piaget believed that young infants who do not reach for a hidden object show that they have not yet developed object permanence and are unaware of the continued existence of the object once it is out of sight.the correct option is:B) were unaware of the existence of the object.
Step-by-step explanation:
Jean Piaget believed that young infants' failure to reach for a hidden object indicated that they were unaware of the existence of the object once it was out of sight. This concept is known as object permanence, which is the understanding that physical things continue to exist even when they cannot be observed. Infants develop object permanence during the sensorimotor stage which lasts from birth to about 2 years old.
Piaget observed that infants who had not yet developed object permanence would not search for the hidden object, displaying a lack of understanding that the item still existed even though it was no longer visible.the correct option is:B) were unaware of the existence of the object.