Suppose That Independent Variable a Explains 24 Percent of the Variation

Suppose that independent variable A explains 24 percent of the variation in a dependent variable.Suppose that independent variable B has a bivariate correlation of .40 with that same dependent variable, but that after controlling for variable A, it explains only 1 percent of the variation in the dependent variable.Then:

A) The partial r for variable B is .10.
B) The multiple correlation between both variables and the dependent variable is .50.
C) Multicollinearity exists between the two independent variables.
D) All of these.