Which Statement About Siblings with Significantly Different IQs Is True

Which statement about siblings with significantly different IQs is true?

A) The less intelligent sibling will earn approximately half the income as the more intelligent sibling.
B) Despite differing in intelligence, the siblings will receive approximately the same number of years of education.
C) Despite differing in intelligence, siblings will earn approximately the same income.
D) The less intelligent sibling will tend to have a faster reaction time on basic tasks than the more intelligent sibling.