What Can You Say About His Intelligence in Comparison to Others

What can you say about his intelligence in comparison to others his age?

A) Eric has become comparatively less intelligent, as his IQ should actually increase with age.
B) Eric has become comparatively less intelligent, as it is more difficult to get a high score at age 5 than it is at age 22.
C) Eric has become comparatively more intelligent, as it is more difficult to get a high score at age 22 than it is at age 5.
D) Eric's comparative intelligence has remained stable.