The issue during the Progressive Era that would most likely have united Mary Harris "Mother” Jones and Lewis Hine is option A. ending child labor
The Progressive Era was a period of widespread social activism and political reform across the United States of America that spanned the 1890s to World War I. The main objectives of the Progressive movement were addressing problems caused by industrialization, urbanization, immigration, and political corruption.
Therefore, the correct answer is option A.
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