Even Though More Than 2

Multiple Choice

Even though more than 2.3 percent of people have IQs below the 70 cutoff,only about 1 percent of the population has an intellectual disability.The prevalence of intellectual disability is lower than the prevalence of low IQs because

A) IQ tests are not reliable.
B) most forms of intellectual disability have biological causes.
C) many adults with low IQs have adequate adaptive skills.
D) only people younger than age 18 can be diagnosed with intellectual disability.