According to Terman's original computation of intelligence quotient, if Ralph's computed IQ score is 75, then

a. he might be a 12-year-old who is as smart as the average nine-year-old.
b. he correctly answered three-fourths of the questions on the intelligence test.
c. he is 75 years old.
d. he might be a 6-year-old who is as intelligent as most eight-year-olds.
e. he is as smart as the average 75-year-old.

a. he might be a 12-year-old who is as smart as the average nine-year-old.