Captured northern china and southern Russia is the best phrase that completes the diagram showing growth of the Mongol empire.
What was Mongol empire?
The greatest contiguous land empire in history was the Mongol Empire, which existed in the 13th and 14th centuries. The Mongol Empire, which had its origins in modern-day Mongolia in East Asia, at its height spanned from the Sea of Japan to parts of Eastern Europe, extending northward into the Arctic, eastward and southward into the Indian subcontinent, Mainland Southeast Asia, and the Iranian Plateau, and westward as far as the Levant and the Carpathians.
Genghis Khan (c. 1162–1227), who was recognized by a council in 1206 as the head of all Mongols, led the consolidation of many nomadic tribes in the Mongol homeland into the Mongol Empire. Under his and his successors' leadership, the empire expanded quickly as they dispatched armies of invasion in all directions. In an imposed Pax Mongolica, the huge transcontinental empire linked the East with the West, the Pacific with the Mediterranean, and allowed the diffusion and exchange of trade, technology, goods, and philosophies throughout Eurasia.
Supporting answer
Hence, Option C is correct answer
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