Answer:
A. by claiming that the union had created an illegal trust
Step-by-step explanation:
The Sherman Anti-Trust Act was passed by Congress, with the help of President Benjamin Harrison, in 1890. Such act announced unlawful any business blend that tried to control exchange , trying to check the development of restraining infrastructures.
The Sherman Anti-Trust Act was utilized when the specialists of the American Railway Union were on a strike, known as the Pullman Strike, which happened in 1894 when George Pullman, the leader of the Pullman Palace Car Company, chose to decrease the pay rates of his laborers. Because of the utilization of the Trust Act on such clash the leader of the American Railway Union, Eugene Debs, was arrested.