In Many Countries, Like the U

In many countries, like the U.S., educational attainment predicts one's social class better than parent's occupation does because

A) the more education you have it is harder to find work and thus the poorer you will be.
B) the more education you have the higher the average lifetime income you will earn.
C) parent's occupation never means much in understanding social class.
D) these countries have complex social systems which make it difficult to predict social class.