There are an infinite number of motor solutions for an action (e. g. in terms of different joints, angles, and trajectories, this problem is known as:

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane

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.  

it should be d or b but i'm sure it's d

answer; being clearly political;