The answer is option D "a document made by someone who actually saw an event." A primary source would be like a witness during a event. They can give reliable information on what happened during that event. Main primary sources are: documents, pictures or photographs, and objects that can explain what happened during a event.
Hope this helps!
D) export resources for the mother country's benefit
CHINESE Communism did not originate as a direct result of activities carried on in China by the Third International. It owed its first beginnings to Chinese students returned from Soviet Russia. Occupied with the consolidation of the Revolution and throwing the weight of its international effort toward Central Asia, Moscow did not realize the potentialities of China until 1919. Moscow then saw that China offered an almost priceless first step in the world revolution. Fomentation of Chinese turmoil would result in the destruction of the special position enjoyed by "capitalistic" states in China. From that time on Moscow was active. It worked …
The last one. D. explanation: don’t really have one I just looked it up
