The Adjusted Value of the Coefficient of Determination

The adjusted value of the coefficient of determination

A) will always increase if additional independent variables are added to the regression model.
B) is equal to the proportion of the sum of the squared deviations of the dependent variable from its mean that is explained by the regression model.
C) is always greater than the proportion of the sum of the squared deviations of the dependent variable from its mean that is explained by the regression model.
D) is always less than the proportion of the sum of the squared deviations of the dependent variable from its mean that is explained by the regression model.