What Was the Important Difference Between the Test of Mathematical

What was the important difference between the test of mathematical ability conducted by Mehler and Bever and that conducted by Piaget?

A) Mehler and Bever used candy and thus increased the children's motivation.
B) Piaget expected the children to be able to write their answers, not verbalize them.
C) Piaget used children with no previous math experience.
D) Mehler and Bever only used children who had previously attended preschool.

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