Question

The Elkins Act and the Hepburn Act regulated railroads by
outlawing kickbacks to the smallest companies and setting higher railroad rates.
outlawing rebates to the largest customers and setting railroad rates.
outlawing tax breaks to the largest railroads and changing railroad rates.
outlawing tax breaks to the smallest companies and raising railroad rates.

Answer 1

outlawing rebates to the largest customers and setting railroad rates.

Explanation: The 1903 Elkins Act prohibited railroads from giving special rebates to favored shippers, and the 1906 Hepburn Act strengthened the Interstate Commerce Commission by empowering it to set maximum railroad rates and broadened its regulatory authority.