During pax mongolica, why were traders and travelers treated as they were?
a) as intruders in the land, they were escorted out quickly to keep the peace.
b) as deliverers of both news and goods not produced in the region, they were seen as important to the economy of the region.
c) they were typically robbed and left to the elements.
d) there were only a few cases of successful trade transactions during pax mongolica.