Correct Option: A

The Xinhai Revolution, also known as the Revolution of 1911 or the Chinese Revolution,
overthrew China's last imperial dynasty, the Qing Dynasty, and established the Republic of China. The revolution was named Xinhai because it occurred in 1911, the year of the Xinhai stem-branch in the sexagenary cycle of the Chinese calendar. January 1, 1912, was set as the first day of the First Year of the Republic of China.