In the Binet and Simon scoring system, an 8-year-old child who performed as well as an average 10- year-old would be assigned a mental age of ____________________?

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In the Binet and Simon scoring system, an 8-year-old child who performed as well as an average 10- year-old would be assigned a mental age of ____________________?

A. 1.25
B. 8
C. 10
D. 12.5