How did the united states government respond to the 'great railroad strike'?

a) they took no action and allowed the workers and owners to settle the dispute.

b) they sent federal troops to end the strike.

c) they passed the sherman anti-strike act.

d) they passed the interstate commerce act.

The Great Railroad Strike of 1877, sometimes referred to as the Great Upheaval, began on July 14 in Martinsburg, West Virginia, United States after the Baltimore & Ohio Railroad (B&O) cut wages for the third time in a year. This strike finally ended some 45 days later, after it was put down by local and state militias, and federal troops. Because of economic problems and pressure on wages by the railroads, workers in numerous other cities, in New York, Pennsylvania and Maryland, into Illinois and Missouri, also went out on strike. 

I think it might be D but I'm not completely sure