Which reformer took up the cause of exposing the dangers and disgraceful working conditions of child labor? a. Upton Sinclair

b. Samuel McClure

c. Mother Jones

d. Ida Tarbell

C. Mother Jones

Explanation:

I hope that this has helped! :)

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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just finished this it is b. centrifugal force