Which Statement About Individuals' Intelligence Tests at Different Ages Is

Which statement about individuals' intelligence tests at different ages is TRUE?

A) The correlation between individuals' IQ scores at a particular age and their scores 5 years later is approximately .90.
B) On average, individuals' IQ scores increase 13 points between age 4 and age 17 years.
C) If intelligence tests are administered according to instructions, there should be no change in an individual's IQ score with age.
D) Children who take an intelligence test at age 12 years and again at age 17 years show an average change, up or down, of 7 points.