Trenton Was Playing in a Sandbox

Multiple Choice

Trenton was playing in a sandbox.He was pouring sand from a short and wide fat container into a tall and narrow container.When he poured the sand into the tall and narrow container,it appeared 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 experiences considerable movement between states of cognitive _____ and _____ to produce cognitive change.

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