Which was an effect of muckraker Ida Tarbell's writing?

AThe American public was shocked by her account of John

DRockefeller's ruthless business practices.

BCongress was stirred to begin an investigation into sanitary practices at the nation's slaughterhouses.

CPresident Roosevelt formed a commission to look into child labor safety and working conditions.

DMcClure's magazine claimed her writing was subversive and refused to publish any more of her stories.