What word do we use to describe the breaking down of a compound??​

Compounds being broken apart using chemical change is called decomposition reaction. An example of this is when Electrolysis is used to break down a compound

decomposition reaction

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.