Ahmed is a child who is able to walk around and use his senses to better understand the world around him. Ahmed's mother likes to take a small pre-packaged apple sauce and put it into a glass bowl for breakfast. The glass bowl is larger than the original apple sauce container. Ahmed is almost always convinced that his little sister ate some of his apple sauce because there appears to be less. According to Piaget's theory of cognitive development, which stage of development is Ahmed in? a. concrete operational
b. preoperational
c. sensorimotor
d. formal operational