I believe it was the ability to share information on who to trust- in other words, gossip. There was probably a multitude of things that set them apart, though, so Imight be incorrect.
During the 10th Century the kingdom of Kiev (also known as Kievan Rus') controlled the trade routes for furs, wax, and slaves between Scandinavia and the Byzantine Empire.
Answer:
C. The potential rental income that a homeowner can get from the house
Explanation: