How did the efforts of A.Philip Randolph help further civil rights in the United States?

AHe demanded that minorities be allowed to serve in non-segregated units of the marine corp.

BHe persuaded leaders to pass an order forcing employers to stop discriminating against workers on the basis of race.

CHe encouraged the government to release the nations scientists from other duties to work on the manhattan project.

DHe argued for minority workers to be allowed to strike if their wages were not increased in proportion to their employers profits