Kublai Khan the grandson of Ghenghis Khan defeated the Sung dynasty by having larger Army. Hence the option B is correct.
Defeat of Sung Dynasty
The Sung Dynasty which ruled all over China was defeated by the Mongols, thereby for the first time China came under the direct rule of Mongols.
Kublai Khan was the Grandson of Ghenghis Khan, he was approached by Sung empire to defeat the Jin Dynasty, after which Kublai Khan defeated Sung empire by attacking them with larger army. Hence option B is correct.
Learn more about Sung Dynasty here:
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