A child is shown a large box and a small box. The large box contains a 5-pound weight and the small box contains a 10-pound weight. The child picks up the boxes and looks at them closely, and then is...

A child is shown a large box and a small box. The large box contains a 5-pound weight and the small box contains a 10-pound weight. The child picks up the boxes and looks at them closely, and then is asked which weighs more. The child is no longer focused only on appearances, so he answers that the small box weighs more. Jean Piaget would say that this child is in the _____ stage of cognitive development.

A Metacognitive

B Sensorimotor

C Concrete operational

D Preoperational