A Regression Analysis Between Sales (In $1,000) and Advertising (In $\hat { y } = 80 + 5 x$

A regression analysis between sales (in $1,000) and advertising (in $1,000) resulted in the following least squares line: $\hat { y } = 80 + 5 x$ . This implies that:

A) as advertising increases by $1,000, sales increases by $5,000.
B) as advertising increases by $1,000, sales increases by $80,000.
C) as advertising increases by $5, sales increases by $80.
D) None of these choices.