Four-Year-Old Joseph Became Very Upset When His Mother Put Turkey

Multiple Choice

Four-year-old Joseph became very upset when his mother put turkey in his cheese sandwich. Even when his mother removed the turkey, he continued to throw a temper tantrum. Joseph has not mastered the Piagetian principle of _____, the idea that an operation can be repeated in the opposite direction.

A) conservation
B) centration
C) seriation
D) reversibility