Binet and Simon considered children behind in their schooling if their
A) mental age equals their chronological age.
B) mental age is lower than their chronological age.
C) mental age is higher than their chronological age.
D) mental age does not equal their chronological age.
Answer: B
Rationale: Binet and Simon used the concept of mental age, the average or typical test score for a specific chronological age, to measure achievement. A child with a mental age lower than his or her actual (chronological) age would be considered behind in his or her schooling.
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