According to Rawls, It Is Important to Forget Our Own

According to Rawls, it is important to forget our own age, gender, race, intelligence, strength, wealth, or social status when determining just actions. What is the purpose of this?

A) This permits us to act as pure American citizens.
B) It keeps us from being self-interested in the ethical values we consider.
C) This makes each individual like a blank sheet of paper on which a contract may be written.
D) It makes it easier to consider the usefulness of our actions.
E) This promotes the assumption that what one personally needs or wants is morally correct.