Answer: C. The act stated that the land could not be taken away for any reason.
Well, it decreased the demand of Slave Labor.
Back then, the technology advancement , especially in agricultural sector, significantly increased the total production. This cause the demand of overall labor decreased. The northern US, who utilized more of this advancement more than their southern neighbor, manage to produce hundred times more output than the southern who still depended on their slave labor
New Weapons Turn The Tide
With the new military technology, not only changed the War of the 100 years, but the whole war began to change in the world, like the English using cannons that could destroy the French castles; and new weapons like crossbows, which could shoot more arrows. While, among the French, the feeling of patriotism and nationalism began to grow as well, the English began to change the concept of fiefs, since the English needed large armies instead of feudal lords. The Italian cities flourished while England and France were recovering, and those Italian cities brought the Renaissance, the Reformation and the Age of Exploration.
The last battle is the answer :)
One of the main goals of the Farmers' Alliance was to obtain cheaper land, since some of the laws that had been in place since prior to the Civil War were still keeping farmers from enjoying cheap land.