Eric Has an IQ of 100 at Age 5 Years

Eric has an IQ of 100 at age 5 years and an IQ of 100 at age 22 years. What can be said about his intelligence in comparison to others his age?

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