Gerard Watched as a Researcher Placed Five Toy Station Wagons

Gerard watched as a researcher placed five toy station wagons and three toy convertibles on a table. The researcher asked him if there were more station wagons or more cars, and Gerard correctly answered that there were more cars. Gerard's answer indicates that he has mastered ​

A) conservation of number.
B) object permanence.
C) preaccommodation.
D) hierarchical classification problems.

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