John Rawls's Promoted Which of the Following in Terms of Promoting

John Rawls's promoted which of the following in terms of promoting justice?

A) the consultation of an outside source, such as a book or person, for guidance
B) the belief that the moral rules should be determined by persons who have a "veil of ignorance" about their place or station in society
C) the belief that a person must decide what course of action is proper based on that person's own set of beliefs or feelings
D) determining which course of action produces the greatest amount of good for the greatest number of people
E) a set of universal rules based on reasoning which must be applied in all situations and are characterized by reversibility