Binet used the term mental age to refer to
a. the average chronological age of children who completed a particular grade in school
b. the years of formal education successfully completed by a child.
c. the total numer of items correctly answered on an intelligence test divided by the respondent’s chronological age.
d. the chronological age that most typically corresponds to a given level of intelligence test performance.

D. The chronological age that most typically corresponds to a given level of intelligence test performance

Explanation:

In order to measure the mental age of individuals , binet will provide a test to measure how well those individuals perform the individual tasks relative to the capabilities of other people on their age group.

The mental age later on will be used to measure the overall IQ score by using this formula:

IQ = Mental age ÷ Physical age × 100

answer; observing;