Cities were able to expand their geographic areas in the late 19th century because of the development of a. mass transit. b. settlement houses. c. skyscrapers. d. assembly lines.

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.  

answer; delirium is a common adverse reaction seen when elderly patients take diphenhydramine;

answer; humanistic;