In the Formula Y = a + (B₁)(X₁)+ (B₂)(X₂)+ E,the

In the formula Y = a + (b₁) (X₁) + (b₂) (X₂) + e,the term "b1" refers to

A) the fixed influence that applies to all individuals.
B) the sum of influence of all variables on the first criterion variable.
C) the degree of influence of the first predictor variable on the criterion variable.
D) the degree of error associated with the first predictor variable.