Question

large numbers of people settled on the great plains because of
the consolidation of farms. the passage of the
homestead act. the beginning of the
depression.
the use of steam tractors.

Explanation:

The Homestead Act (1862) offered 160 - acre plots of public land in the Great Plains to settlers who met requirements, directly encouraging large - scale settlement. Farm consolidation, steam tractors, and the Depression are not the main reasons for initial large - scale Great Plains settlement.

Answer:

B. the passage of the Homestead Act.