Explanation:

Because of ‘after the war,’ both options I and II can be used. ‘On the eve of’ is a phrase which means ‘on the day before an important event, or during the period of time just before it.’ So, option II basically means ‘before the war.’ Annexation is the administrative action and concept in international law relating to the forcible transition of one state's territory by another state. It is generally held to be an illegal act. The sentences are not about any annexation instead they are about soybean trade. So, option III can’t be used. Therefore, option A is the apt answer. New statements: Before the end of the war Japan was dependent on occupied Manchuria and colonized Korea for its soybean supply and after the war, the U.S. required that Japan reconfigure its trade ties towards itself and its bloc, away from China and Korea as the Cold War progressed. On the eve of war Japan was dependent on occupied Manchuria and colonized Korea for its soybean supply and after the war, the U.S. required that Japan reconfigure its trade ties towards itself and its bloc, away from China and Korea as the Cold War progressed.