You are trying to predict an industry's sales by estimating the relationship between past sales growth and GDP growth. In order to arrive at an estimate, you must a regression with: 

A. Nominal sales growth as Y-variable, and nominal GDP growth as X-variable

B. Nominal GDP growth as Y-variable, and nominal sales growth as X-variable

C. Real sales growth as Y-variable, and real GDP growth as X-variable

D. Real GDP growth as Y-variable, and real GDP growth as X-variable

E. Nominal sales growth as Y-variable, and real GDP growth as X-variable

F. Real sales growth as Y-variable, and nominal GDP growth as X-variable

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