Final answer:
Freda's baby, who shifts attention away from a hidden toy, is exhibiting behavior consistent with Piaget's sensorimotor stage, where the understanding of object permanence is still developing. The baby's lack of search for the hidden key chain indicates that this milestone has not been fully achieved yet. the correct option is d. has not yet learned the rule of object permanence.
Step-by-step explanation:
According to Jean Piaget's stages of cognitive development:
Freda's baby is in the sensorimotor stage, which lasts from birth until about 2 years old. In this stage, one of the milestones is developing object permanence, the understanding that objects continue to exist even when they cannot be seen or heard. Freda's 6-month-old baby, who is fascinated by a toy key chain but does not search for it once it is hidden, most likely has not yet developed object permanence.
During the sensorimotor stage, babies learn about the world through their senses and actions. Between 5 and 8 months old, babies typically begin to develop object permanence. However, if a baby does not show signs of remembering an object after it has been hidden, it means they have not yet fully grasped this concept. Piaget's studies showed that infants who have developed object permanence will reach for the hidden toy, indicating that they know it still exists.