Who Exposed child labor and working conditions through his use of the camera during the progressive era?

i think the answer is a and i hope this ; ))

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

hi   i took this test in k12 2 weeks ago your answer is the name of it 14 points it failed because america was not behind him with this idea and it nevr passed the sentate

2   irelenad and jews wernt with him because he was focusing more on the war then them

i believe out of the choices it is a.