A. Incorrect. On the contrary, it was vice versa. Ever wonder why so many people in South Africa speak French?
B. Incorrect. Once again, it was the other way around.
C. Correct. At first, the Portuguese wanted mainly gold and slaves from Africa. European nations then imperialized Africa for commodities, benefits in trade, and because they simply wanted to expand their power.
D. This one's kind of obvious. Incorrect.