Trenton Was Playing in the Sandbox

Multiple Choice

Trenton was playing in the sandbox. He was pouring sand from a short, fat container into a tall, skinny container. When he poured the sand into the tall, skinny container, it looked to him as if it had more sand in it. Trenton could not figure out where the extra sand came from, and how it got into his container. As Trenton continues to try to solve this puzzle, he will experience considerable movement between states of cognitive _____ and _____ to produce cognitive change and eventual understanding.

A) equilibrium; disequilibrium
B) adaptation; organization
C) classification; modification
D) equilibration; categorization