Piaget's formal operational stage of cognitive development is marked by the first appearance of the ability to ____.
a. conserve number and amount
b. engage in abstract, hypothetical thinking
c. form mental representations
d. perform logical operations
Question 2
Martina has just begun to be able to carry on discussions about hypothetical worlds and counterfactual possibilities. Martina has just ____.
a. entered the formal operational stage
b. resolved her identity crisis
c. learned to take the perspective of other people
d. entered the stage of postconventional moral reasoning