Why did Mayan script (from present-day Mexico), never reach the Inca, living in South America?
The Maya were jealous
of the Spanish-Inca
relationship, and so
refused to share their
writing
The Mayan writing was
incredibly complicated,
so the Inca created
their own system of
written
communication.
Ideas, people, farming
and animals have a
difficult time moving
north and south
through different
latitudes.
The Inca
determined it was
easier to use
Egyptian
hieroglyphs.

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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; adjusting and adapting to a culture other than one's own;