When Adjusted for Cost-Of-Living Increases,which of the Following Statements About

When adjusted for cost-of-living increases,which of the following statements about the earnings of middle-class men is true?

A) Since 1973,the wages for middle-class men have steadily increased.
B) Since 1973,the wages for middle-class men have sharply declined.
C) Since 1973,the wages for middle-class men have steadily declined.
D) Since 1973,the wages for middle-class men have remained essentially unchanged.