The three correct answers regarding how communist and nationalist forces influenced China are:
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They caused political conflict and civil war.
The rivalry between the Chinese Nationalist Party (Kuomintang) and the Communist Party of China led to significant political conflict, culminating in the Chinese Civil War. -
They worked together to overthrow China's last imperial dynasty.
Both the Nationalists and the Communists initially collaborated during the Northern Expedition in the 1920s to unify China and dismantle the Qing Dynasty's remnants. -
They gave rise to authoritarian forms of government.
Both the Nationalist government under Chiang Kai-shek and the later Communist government under Mao Zedong established authoritarian regimes in China.
The other options provided about preventing Japanese occupation and the encouragement of foreign trade do not accurately reflect the direct influence of these forces during that period.