How Would a β₁ Slope Value of + 2

How would a β₁ slope value of + 2.5 be interpreted?

A) For a one unit increase in the outcome variable, the predictor variable decreases by 2.5
B) For a one unit increase in the outcome variable, the predictor variable increases by 2.5
C) For a one unit increase in the predictor variable, the outcome variable decreases by 2.5
D) For a one unit increase in the predictor variable, the outcome variable increases by 2.5