Question:  The main purpose of the veil of ignorance in NAME_1's theory of justice is to
A: prevent people in the original position from making rational decisions about guiding social principles.
B: prevent people in the original position from selecting principles that favor their particular positions .
C: guarantee that people in the original position do not form alliances with others.
D: ensure that everyone in the original position is aware of his or her own conception of the good.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.