Answer:
B. Settlers entering the Unassigned Lands on trains grabbed land near the tracks.
Step-by-step explanation:
The Unassigned Lands were lands of an area of more than 1 million acres that were located in the future state of Oklahoma. Those lands were not assigned to a particular Indian Tribe, therefore people believed it did not have an owner, some even defended that those areas should be open to white settlement.
With no one to “protect” the land, settlers decided to enter those Unassigned Lands and grab some land that was near the tracks, predicting that would be a good place to live or build something.