Speed limits and drinking ages fall under the police powers of state government, yet the national government has established maximum speed limits and uniform drinking ages. How is it possible for the national government to encroach on the reserved powers of the states

answer; i do believe its (b) 12.5 years of age;

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.  

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explanation:

answer; c.wright mills;