What Accounts for the Growing Political Dominance of Moscow Under

What accounts for the growing political dominance of Moscow under Mongol rule?

A) Moscow was the only Russian city that was not destroyed during the invasion.
B) As the city located farthest south in Russia, Moscow was better able to benefit from renewed trade under the Mongols.
C) Moscow became the capital of the Golden Horde.
D) The princes of Moscow collected tribute for the Mongol khans and became the seat of the Metropolitan of the Orthodox Church.