Final answer:
During World War I, General Paul von Hindenburg and General Erich Ludendorff became the supreme commanders of all Central Powers forces.
Step-by-step explanation:
During World War I, two German generals became the supreme commanders of all Central Powers forces. They were General Paul von Hindenburg and General Erich Ludendorff. Hindenburg was the chief of the German General Staff and Ludendorff was his deputy. Together, they led the Central Powers' military strategy and operations.