What Was the Main Importance of the Government's Establishment of the Interstate

What was the main importance of the government's establishment of the Interstate Commerce Commission?

A) It established the principle of federal government regulation of business that crossed state lines
B) It allowed the federal government to set maximum railroad rates.
C) It limited the ability of railroads to form monopolies.
D) It ended the ability of states to regulate railroads within their boundaries.
E) It created the foundation for the interstate highway system.