Answer:
c. led a successful communist revolution in China.
Explanation:
Mao Zedong was a Chinese politician and dictator, the top leader of the Communist Party of China (CCP) and founder of the People's Republic of China. Under his leadership, the Communist Party took power in mainland China in 1949, when the new People's Republic was proclaimed, after the victory in the Chinese Revolution against the forces of the Republic of China. The communist victory caused the escape of Chiang Kai-shek and his followers of the Kuomintang to Taiwan and made Mao the top leader in China until his death in 1976. The Mao stage of government was characterized by intense campaigns of ideological reaffirmation, which would cause great social and political upheavals in China, such as the Great Leap Forward and especially the Cultural Revolution, at which time its power reached the highest levels as an intense Personality cult around his figure. Even today, Mao's historical role is surrounded by great controversy.
I believe the answer is: the DSM-5.
the DSM-5 filled with standard classifications that professionals in psychological field can used to identify the type of illness that their patients have. With this classifications, we hoped that there would be less cases when different psychologists offered different conclusions and make the patients confused.

People play a very important role in the process of development as :
- People themselves are a part of development
- Contribution and a small hand itself from the side of people provide a great help.
- Mutual understanding amoung other people and spreading of awareness.