Which labor union formed in 1886, with samuel gompers as president, to provide trade unions with a national voice?
american federation of labor
american legion
knights of labor
national labor union

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;

the answer is d because for c the actors can't love acting for the other's audience their not even in the same show, it can't be b either because the question is talking about the actors not the audience, and it can't be a because   it's not specific enough