Abdul is asked the question, "What if humans didn't have hands or feet?" He knows that most humans do have hands and feet, and says, "Well, I guess we wouldn't need shoes or gloves anymore. But it would probably be difficult to keep one's balance if they had no feet" In what stage is Abdul, according to Piaget? a. formal operations a. formal operations b. concrete operations b. concrete operations c. preoperational c. preoperational d. reversibility