How did Lewis Hine contribute to labor reform during the Progressive era?
A. By raising awareness of dangerous child labor practices through
his work photographing child workers
B. By leading the American Federation of Labor and increasing union
membership among skilled workers
C. By reporting on the deadly strikebreaking practices used against
miners and their families in the Ludlow Massacre
D. By exposing the fact that worker deaths were preventable in the
Triangle Shirtwaist Factory fire
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