How was the qing dynasty replaced by a republic?

The Correct Answer is the Qing dynasty was replaced by the Chinese revolution of 1911.

Explanation:

The main cause of this Revolution was the failure of the Qing dynasty to modernize it's country's economy.This led to a series of protests and revolts in the country. The Revolution ended by the collapsed of the Qing dynasty in February 1912, and this ended 2,000 years of Imperial rule and the beginning of China’s Republican Era.The Chinese revolution of 1911 is also known by the Xinhai Revolution this results in the collapsed of the Qing Dynasty and the Republic of China was founded.    

The correct answer is b