Singapore airlines is recognized as an industry leader for exemplary customer service, and has continued to add new ways to serve customers better than competitors. in doing so, it has focused on sustaining its competitive advantage through excellence.

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; marvin gaye;