Please help me solve!

Fact Pattern: Many firms have site location models to predict future sales (Y) at locations yet to be developed. Some explanatory variables that could be used are: population density within a specific radius (X1), traffic flow (X2), the number of competitors (X3), and the ease of entry into and out of the proposed site (X4). An abbreviated computer printout of a linear analysis yields: DEPENDENT VARIABLE: Y N: 12 R: .986 R SQUARED: .972 STANDARD ERROR: 3800 VARIABLE CONSTANT X1 X2 X3 X4 COEFFICIENT 124,000 5 350 -1,700 4,000 According to the computer printout, if traffic flow increased by one more unit, sales would A. Increase by 5. B. Decrease by 1,700. C. Increase by 4,000. D. Increase by 350. Fact Pattern: Many firms have site location models to predict future sales (Y) at locations yet to be developed. Some explanatory variables that could be used are: population density within a specific radius (X1), traffic flow (X2), the number of competitors (X3), and the ease of entry into and out of the proposed site (X4). An abbreviated computer printout of a linear analysis yields: DEPENDENT VARIABLE: Y N: 12 R: .986 R SQUARED: .972 STANDARD ERROR: 3800 VARIABLE CONSTANT X1 X2 X3 X4 COEFFICIENT 124,000 5 350 -1,700 4,000 According to the computer printout, if traffic flow increased by one more unit, sales would A. Increase by 5. B. Decrease by 1,700. C. Increase by 4,000. D. Increase by 350