Which was an effect of muckraker Ida Tarbell's writing?
a. The American public was shocked by her account of John
d. Rockefeller's ruthless business practices.
b. Congress was stirred to begin an investigation into sanitary practices at the nation's slaughterhouses.
c. President Roosevelt formed a commission to look into child labor safety and working conditions.
d. McClure's magazine claimed her writing was subversive and refused to publish any more of her stories.