Write any four differences of GDP and PCI.​

Gross domestic product (GDP) is the value of a nation's finished domestic goods and services during a specific time period. A related but different metric, the gross national product (GNP), is the value of all finished goods and services owned by a country's residents over a period of time

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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hope this !