A. General Yi knew that the Ming dynasty was more powerful than Mongols were and judged that if he attacked, the Ming would likely invade Korea. B. Upon his arrival in Kaesŏng, General Yi toppled the government through a military coup and in 1392 CE, he placed himself on the throne —ushering in the Chosŏn Kingdom. C. Due to his prominence in 1388 CE, the anti-Ming (pro-Mongol) faction sent General Yi to expel a contingent of Ming troops stationed on the northern part of the Korean Peninsula. D. Seeing the campaign as a potential disaster, General Yi turned his troops south towards the Koryŏ capital, Kaesŏng.
Sentence A talks of General Yi judging that the Ming dynasty was more powerful than the Mongols. The other sentence that refers to the Mings and Mongols is sentence C. We see that sentence C provides an introduction to General Yi (“due to his prominence in 1388 CE…?) and also clarifies that the anti-Ming faction was pro-Mongol. It is hence clear C comes before A in the paragraph. So we rule out answer choices a and c. We also see that sentence C talks of General Yi being sent on a campaign. Sentence D tells is that General Yi saw that the campaign was a disaster. Sentence A tells us why so. So the sentence arrangement CAD makes sense. Sentence B talks of the General’s arrival in Kaes?ng. Sentence D introduces Kaes?ng as the Kory? capital. Hence D comes before B. The only answer choice with this arrangement is b. CADB, which is the correct answer. The question is " Arrange the sentences in the correct order " the order is CADB Hence, the answer is CADB Choice B is the correct answer.