As a first-grade teacher reads a book about penguins in Antarctica, she points to Antarctica on a globe. Six-year-old John seems really puzzled. "How come they don’t fall off the earth?" he asks. From Piaget’s perspective, John can best be described as:
a. Experiencing disequilibrium
b. Accommodating when he should be assimilating
c. Having difficulty with class inclusion
d. Have difficulty with conservation