The correct option is 4
They stimulated the economy by increasing trade and creating a need for additional taverns and inns.
The Crusaders opened up the path for Europe to have a relationship with Asia.This led to development of international trade relations that led to the exchange of goods and ideas, and development of taverns and inns along the way.
Well perhaps if there was actually a map that question could be answered...
I think 3... Hope this will help