Why was China so important to success in the war against Japan

Subject- Why was China so important to success in the war against Japan

Question- Despite the prolonged onslaught of Japan's modern military machine for eight long years, a divided China, mostly on its own, put up a heroic fight against steep odds, pinning down 600,000 of its troops and playing a crucial role in weakening Japan by inflicting heavy casualties on forces that were better armed

c. women being denied the type of education men received