The expansion of the Mongol empire depended not only on the Mongols'

The expansion of the Mongol empire depended not only on the Mongols' rigorous training and the discipline of their soldiers but also they implemented a highly organized supply and communication network among their many widespread armies and then enabling them to receive their current orders and some replenishment of their weaponry.


A. they implemented a highly organized supply and communication network among their many widespread armies and then enabling them Incorrect

B. on their implementation of a highly organized supply and communication network among their many widespread armies, who were then able Correct

C. because of their implementation of a highly organized supply and communication network among their many widespread armies, who they enabled Incorrect

D. on their implementing of a highly organized supply and communication network among their many widespread armies and they enabled them Incorrect

E. implementing a highly organized supply and communication network among their many widespread armies, enabling them Incorrect

correct parallelism - ................not only on .............................but also on.................
eliminate A, C & E

D - implementing uses wrong, they introduce parallelism error and also they refers to what?

Answer - B