According to the authors of your text, consumers are advised to be less concerned about the presence of subliminal messages in advertising and more concerned that ads

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; /// you data to develop general ideas or theories;

answer; speaker;