In recent years, which factor has been major reason for the economic tensions between the United States and China ?

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In recent years, which factor has been major reason for the economic tensions between the United States and China ?

A. China’s trade deficit with the United States was very high
B. The United States refused to place quotas on Chinese goods
C. The United States imported more from China than it exported to China
D. China lowered tariffs on goods imported from the United States