Adam's IQ at this age is relatively ______ and a _____ predictor of his IQ at age 18.

A) unstable; bad
B) stable; bad
C) unstable; good
D) stable; good

Research shows that IQ scores become more stable as a person gets older, so at seven years old, Adam's IQ score is likely to be a relatively stable predictor of his IQ at age 18. Additionally, a high IQ at a young age is generally a good predictor of future intelligence, as long as the child continues to receive appropriate intellectual stimulation and education. Therefore, the best choice is D, stable and good.