The answer would be D.
D. Wealth of Knowledge-so much information was brought back from the Muslim "world"; information pertaining to medical knowledge, new forms of mathematics and education, "Aristotle was brought back," and "everything was brought back"; so many new ideas were brought back to Europe from the Muslim "world".
Someone who experienced it and was there when it happened
The correct answer is economic and political
State societies are motivated by their economic self-interests which basically involve securing the material well-being of its citizens. Also, wars are motivated by politics which is basically about who gets what as a result of the war
He didn't trust them with his money and shut down the banking system
The correct answer is D.
Many of the European countries involved in the era of imperialism had a large standing army. Countries like Great Britain and France had been around for centuries and built a strong military. The other three are all important factors that lead to the increase of imperialism in the 1800's.