How did the soviet union chinese communists

ok lets start

In the Western world, the Sino–Soviet split transformed the geopolitics of the bi-polar cold war into a tri-polar cold war; as important as the erection of the Berlin Wall (1961), the defusing of the Cuban Missile Crisis (1962), and the end of the Vietnam War (1945–1975), because the rivalry, between Chinese Stalinism and Russian coexistence, facilitated and realised Mao's Sino–American rapprochement, by way of the 1972 Nixon visit to China. Moreover, the Sino-Soviet split voided the Western political perception that "monolithic communism", the Eastern Bloc, was a unitary actor in geopolitics, especially during the 1947–1950 period in the Vietnam War, which led to U.S. military intervention to the First Indochina War (1946–1954).[5] Historically, the ideological Sino-Soviet split facilitated the Marxist–Leninist Realpolitik by which Mao established the tri-polar geopolitics

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.