Gilbert Notices That His Sausage Is Sliced into Six Pieces

Multiple Choice

Gilbert notices that his sausage is sliced into six pieces, whereas his brother's is sliced into nine pieces. He understands, however, that his brother's sausage is not actually any larger than his own. This indicates that Gilbert has by now reached the ________ stage of development.

A) concrete operational
B) Sensorimotor
C) formal operational
D) preoperational