For the Multiple Regression Model $\hat{ Y }$ = 3 - 4x₁ + 5x₂ + 2x₃,a Unit Increase

For the multiple regression model $\hat{ Y }$ = 3 - 4x₁ + 5x₂ + 2x₃,a unit increase in x₁,holding x₂ and x₃ constant,results in:

A) an increase of 4 units in the value of y.
B) a decrease of 4 units in the value of y.
C) a decrease of 4 units,on average,in the value of y.
D) an increase of 6 units in the value of y.