During the High Middle Ages, how did pilgrimages for the Crusades affect the economy?

A: There was a negative effect on the economy because towns had to pay to build more roads for travel.
B: There was a positive effect because those who joined the Crusades no longer had to be supported financially.
C: They hurt the economy because people moved away from towns and villages and traveled to other places.
D: They stimulated the economy by increasing trade and creating a need for additional taverns and inns.