The "Big Three" countries were the United States, Great Britain and Russia. They were called this because they were by far the most important allied players during the war, with Russia and Britain taking on most of the casualties.
C. Growth of trade with the Middle East.
Because the Crusaders have ruled the Middle East for awhile, they established connections with some of the people groups there. And even though they lost the war, they still brought back valuable inventions and products (not inventions, like food, etc) that helped europeans in many way
hope this helps
The first answer sounds correct.
