Well, I am pretty sure that the correct answers will be C and D. This is because when people had traveled with Marco Polo they had seen all of the opportunity that they were missing when they weren't trading what they had traded with the Orient when they first started. The Crusades influenced a lot of people to start trading with others I personally think that they forced some people to do it but we don't know that for sure.
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It helped their crops tremendously with growth and production. Floods fed the crops enough to produce a lot and grow aswell.
