Why did european nation want to colonize africa?

Between the 1870s and 1900, Africa faced European imperialist aggression, diplomatic pressures, military invasions, and eventual conquest and colonization. At the same time, African societies put up various forms of resistance against the attempt to colonize their countries and impose foreign domination.

The main reason for European colonizing of Africa was greed and capitalism. European nations saw an opportunity for new trading routes and wealth in Africa's natural resources. The geographical limitations of Europe were also a factor in it as well. By the later period of the 19th century, all of Europe was occupied.

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.