A Multiple Regression Model Has the Form $\tilde { y } = 8 + 3 x _ { 1 } + 5 x _ { 2 } - 4 x _ { 3 }$

Multiple Choice

A multiple regression model has the form $\tilde { y } = 8 + 3 x _ { 1 } + 5 x _ { 2 } - 4 x _ { 3 }$ .As x₃ increases by one unit,with x₁ and x₂ held constant,the y on average is expected to:

A) increase by 1 unit.
B) increase by 12 units.
C) decrease by 4 units.
D) decrease by 16 units.