The practical nurse (PN) observes an infant searching for a fallen toy. According to Piaget, which additional finding should the PN correlate with this developmental stage?

A. Comprehension of simple commands might be seen in older infants or toddlers but is not specifically correlated with an infant searching for a fallen toy. B. Ability to place objects in a container typically occurs in the sensorimotor stage but is not directly related to the scenario of an infant searching for a fallen toy. C. Visible or audible separation anxiety is more common in younger infants when separated from their caregivers and doesn't directly correlate with an infant searching for an object. D. Exploration beyond caregiver presence is characteristic of the sensorimotor stage in Piaget's theory, where infants develop object permanence and start to explore and search for objects beyond their immediate vicinity, such as a fallen toy.