Which of the Following Correctly States the Effect of Additional

Which of the following correctly states the effect of additional schooling on average personal income?

A) Earning a high school diploma and a college degree does not change average personal income
B) Earning a high school diploma does not affect personal income, but earning a college degree raises personal income.
C) Earning a high school diploma raises personal income, but earning a college degree does not affect personal income.
D) Earning a high school diploma and earning a college degree both raise personal income.