According to Earnest Barker, justice is: ___________?

A. A virtue that cannot be separated from the virtues of temperance, courage and wisdom
B. Not a matter of outright equality but is rather a matter of right proportion
C. A mtter of human relations which change and grow in the process of time with changes of social thought, and it adjusts itself and changes accordingly
D. The first virtue of social institutions, as truth is of systems of thought