The Following Questions Refer to the Excerpt Below

The following questions refer to the excerpt below.
"… There is but one way to remove an evil-and that is,to remove its cause. Poverty deepens as wealth increases,and wages are forced down while productive power grows,because land,which is the source of all wealth and the field of all labor,is monopolized.To extirpate poverty,to make wages what justice commands they should be,the full earnings of the laborer,we must therefore substitute for the individual ownership of land a common ownership.Nothing else will go to the cause of the evil…This,then,is the remedy for the unjust and unequal distribution of wealth apparent in modern civilization,and for all the evils which flow from it…
Henry George,Progress and Poverty,1879
-Which of the following details most directly contributed to the frustrations expressed by Henry George in this excerpt?

A) An increase in the number of immigrants arriving in the US swelled the labor force.
B) Americans began to consider expansion outside of North America.
C) Government subsidies in the post-Civil War period contributed to the industrial boom.
D) During this period, the gap between rich and poor widened significantly.