Final answer:
Sun Yixian broke the grip of warlords and united China under a single government.
Step-by-step explanation:
The statement that best describes Sun Yixian's role in the development of modern China is that he broke the grip of the warlords and united China under a single government. Sun Yixian, also known as Sun Zhongshan, was a key figure in the Chinese revolution and played a crucial role in overthrowing the Qing Dynasty. He founded the Kuomintang (KMT) party and successfully led a series of revolutionary movements that led to the end of imperial rule and the establishment of the Republic of China.
Learn more about Sun Yixian's role in the development of modern China