a. congress's ability to check the executive branch.

b. the influence of public opinion on congress.
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c. gerrymandering in congressional districts.
d. the division of congress into a house and senate.

answer; i believe the correct answer is enlightenment;

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.  

a is your answer hope this ! : )

answer; reliable;