TOEFL Reading: ETS-TOEFL阅读机经 - BFGN69T26EV568A9L$

Which of the following can be inferred from paragraph 2 about residents of Moscow during medieval times? A. Most retained strong cultural and economic ties to Kiev and the South. B. Some were Mongols who came from areas northeast of Moscow. C. Some had fled to Moscow to escape violent attacks from the northeast. D. Most eventually moved on to other locations in the northeast.