Which global process of the 19th century is being described in the passage?
 A)
 European increased reliance on slave labor in order to cut production costs.
 B)
 The value of metals and diamonds began to decrease due to high cost of
 production
 C)
 Africans gaining a distinct economic advantage in the global markets due
 to their extensive mines.
 D)
 European increased need for raw materials and specialized metals in order
 to finance their increased industrialization.