Both the national grange and the farmers’ alliances worked to
a. lower railroad rates.
b. form a political party.
c. reform the crop-lien system.
d. reform the sharecropping system.

Railroads were helpful to the farmers as farmers needed to transport the crops but the rates charged by the Railroads used to be very high. Members of Grange Movement from New York established the National Farmers' Alliance to fight the unfair practice of the railroad transportation. The Grange also lobbied in congress for its political goals like lowering the rates of railroad transportation and rural free mail delivery by the Post Office.

Therefore, the correct answer to this question is:
Option A: Lower railroad rates.