Which Statement Is Not True About Partial Regression Coefficients

Multiple Choice

Which statement is not true about partial regression coefficients?

A) The combined effects of X₁ and X₂ on Y are additive.In other words,if X₁ and X₂ are each changed by one unit,the expected change in Y would be (b₁ + b₂) .
B) The beta coefficients are the partial regression coefficients obtained when all the variables (Y,X_1,X_2...X_k) have been standardized to a mean of 0 and a variance of 1 before estimating the regression equation.
C) Partial regression coefficients have an order associated with them.
D) Both A and B are not true.