Why did china go to war against japan?
to keep germany out of china
to keep control of inroads into korea
to win control of taiwan
to take over control of japan

The correct answer is (B.) to keep control of the inroads into Korea. China never had any conflicts with Germany and already had control over Taiwan. the Japanese empire was the one trying to invade Chinese territory, including Korea. China did not attempt to invade Japan because they were too busy on the defensive.