General John J. Pershing made a major contribution to the Allied victory in World War I by . A transforming inexperienced troops Into an effective military force B developing advanced technologies for battlefield use C requesting humanitarian aid from Congress for war-torn countries D negotiating the terms of the Treaty of Versailles

General John J. Pershing was the commander of the American Expeditionary Forces (AEF) on the Western Front in World War I. His major contribution to the Allied victory was his ability to transform inexperienced troops into an effective military force. This was achieved through rigorous training and effective leadership. Option B is incorrect as Pershing did not develop advanced technologies for battlefield use. Option C is also incorrect as Pershing did not request humanitarian aid from Congress for war-torn countries. Option D is incorrect as Pershing did not negotiate the terms of the Treaty of Versailles.