Question

which best explains how railroad companies were able to standardize their timetables in 1883? by combining into a single railway company by working together voluntarily by unionizing their labor forces by complying with federal legislation

Explanation:

In 1883, U.S. railroad companies voluntarily collaborated to divide the country into four time zones, standardizing timetables to resolve scheduling chaos. No single merged company, federal legislation, or unionization caused this standardization.

Answer:

B. by working together voluntarily