The correct option is B Dr. Sun Yat-Sen
The Opium trade and 'Open Door' policy of the Manchu Dynasty resulted in the Boxer Rebellion. In 1911, a revolution took place under the leadership of Dr. Sun Yat-Sen, which ended the monarchy in China. After the revolution, the Kuomintang party established a republican government in Southern China, under the leadership of Sun Yat-Sen. He stressed on the importance of ideologies like nationalism, democracy, and socialism.