Mrs. Dubois knows that her son, Andre, is very advanced in understanding math compared to his first grade peers. However, he is rather immature in his social relationships and doesn't share or interact well with classmates. His social skills are not what his mother would expect, given his advanced cognitive development in math. Piaget's term for this variation in skills is.

a. hierarchical organization.
b. decalage.
c. preoperational intelligence.
d. accommodation.