For the Following Multiple Regression Model $\hat { y } = 2 - 3 x _ { 1 } + 4 x _ { 2 } + 5 x _ { 3 }$

For the following multiple regression model: $\hat { y } = 2 - 3 x _ { 1 } + 4 x _ { 2 } + 5 x _ { 3 }$ , a unit increase in x₁, holding x₂ and x₃ constant, results in:

A) a decrease of 3 units on average in the value of y.
B) an increase of 8 units in the value of y.
C) an increase of 3 units on average in the value of y.
D) None of these choices.