As Valerie Grows Older, She Becomes Increasingly Proficient in a Variety

Multiple Choice

As Valerie grows older, she becomes increasingly proficient in a variety of tasks involving numerical reasoning, including counting, adding and subtracting, and comparing two-digit numbers. From a neo-Piagetian perspective, Valerie's simultaneous progress in these diverse areas reflects the idea that she:

A) Is in a state of equilibrium
B) Is in her zone of proximal development for numerical tasks
C) Can assimilate diverse mathematical tasks into a single mega-scheme
D) Has a central conceptual structure for numbers