Final answer:
Based on historical context, after the Scramble for Africa, European countries controlled 90% of the African continent, excluding the territories held by any two countries not specified.
Step-by-step explanation:
The question asks about the percentage of Africa that was controlled by European countries after the Scramble for Africa. Considering that at the beginning of the Second Industrial Revolution, Europeans controlled 10% of the African continent, and by the end of the 19th century, after the Scramble for Africa, Europeans controlled 90% of Africa, one can infer that excluding the two countries mentioned in question #6, the rest of Africa was controlled almost entirely by external powers. Therefore, if the Europeans held 90% control and some portions were still ruled by the mentioned two countries, the portion controlled by the rest of the countries would most likely be slightly less than 90%.
Without specific mention of the two countries or their percentage of control, we cannot provide an exact figure, but based on the information provided that Europeans eventually controlled about 90% of Africa, options B) 50%, C) 75%, and D) 90% are possible answers with D) 90% being the most accurate if we consider that the two countries mentioned in question #6 had a minimal impact compared to the overall European control.