The Data Suggest That Wages Increase More with Age for the Highly

The data suggest that wages increase more with age for the highly educated compared to the less educated. This is evidence that

A) the return to education is low for all education levels.
B) the return to education is constant with respect to age.
C) on-the-job training is unrelated to the level of formal schooling.
D) less-educated workers invest in on-the-job training more so than do the highly educated.
E) highly educated people also invest more in post-schooling human capital compared to the less educated.