Marini, of Brock University, and Case, of the University of Toronto

Marini, of Brock University, and Case, of the University of Toronto, tested adolescents on two types of abstract reasoning problems. They found that two-thirds of the adolescents performed at the same reasoning level on the two tasks, while the other one-third performed at a more advanced level on one task compared to the other. This finding

A) indicates, contrary to Piaget's theory, that cognitive development does not occur as existing schemas become more complex
B) indicates, in agreement with Piaget's theory, that both assimilation and accommodation are processes in cognitive development
C) indicates, in agreement with Piaget's theory, that cognitive development changes qualitatively with age
D) indicates, contrary to Piaget's theory, that the application of formal thought is not always uniform across tasks