Question

Which group destroyed cities, looted treasures, and killed thousands in Russia during the thirteenth century? A. Boyars B. Vikings C. Mongol Tartars D. Slavs

Answer 1

The Mongol Tartars invaded Russia in the 13th Century (1200's), and they killed between a quarter and a half of their total population. The Mongol's that invaded Russia had armies of nearly two million people, meaning that it was difficult for some of the smaller towns to stop the invasion.
Hope this helps :) 

Answer 2

I Know it was not vikings or slaves so I guess C