A staff nurse is talking about Piaget's theory with a nursing student. Infants are in the sensorimotor stage of cognitive development during which object permanence is mastered. An example of an infant displaying this ability is:
a) pushing a spoon from her high chair tray to the floor.
b) looking for a toy in her crib at the last place she saw it.
c) shaking a rattle to enjoy the sound.
d) smiling at herself in the mirror.
Answer: looking for a toy in her crib at the last place she saw it.