(C) Manchuria.
Japan invaded Manchuria:
- Following the Mukden Incident, on September 18, 1931, the Kwantung Army of the Empire of Japan invaded Manchuria, starting the Japanese invasion of that region.
- The puppet state of Manchukuo was founded by the Japanese at the end of the war in February 1932.
- Their occupation persisted until the Second World War's conclusion, in the middle of August 1945, when the Soviet Union and Mongolia were successful in their Manchurian Strategic Offensive Operation.
- Since the Russo-Japanese War of 1904–1905, the South Manchuria Railway Zone and the Korean Peninsula have been governed by the Japanese Empire.
- Japan's expanding industrialization and militarization have made them increasingly dependent on US shipments of metal and oil.
Therefore, the correct answer is (C) Manchuria.
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