In the US Each Additional Year of Schooling Has Historically

In the US each additional year of schooling has historically raised a person's wage on average by about

A) 5%.In less developed countries the gap between the wages of educated and uneducated workers is smaller.
B) 10%.In less developed countries the gap between the wages of educated and uneducated workers is smaller.
C) 5%.In less developed countries the gap between the wages of educated and uneducated workers is larger.
D) 10%.In less developed countries the gap between the wages of educated and uneducated workers is larger.