Final answer:
French Premier Georges Clemenceau would have seen the return of Alsace Lorraine to France as a major success, aligning with his goals for securing France's safety and obtaining reparations from Germany after World War I.
Step-by-step explanation:
The leader who would have considered the provision that Germany was forced to give Alsace Lorraine back to France a major success is French Premier Georges Clemenceau. Clemenceau was focused on ensuring France's security and desired severe reparations from Germany, as well as limits on their future military capabilities following World War I. Alsace Lorraine was a territory long in dispute between France and Germany, and its return to France would have been seen as a significant triumph for French interests and Clemenceau's aims at the peace negotiations.