Discussion
The concept of Intelligence Quotient or IQ was developed by
Answer: C
The concept of IQ was developed by Stern.
The German psychologist William Stern proposed in 1912 that mental age be divided by chronological age to give an intelligence quotient:
\[ \text{IQ} = \frac{\text{MA}}{\text{CA}} \]
Lewis Terman later multiplied the ratio by 100 and popularised the term in the Stanford-Binet test (1916). Alfred Binet devised the first practical intelligence test and the idea of mental age, but not the quotient. Francis Galton pioneered the measurement of individual differences.
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