Which sentence is correctly punctuated? A. The Treaty of Versailles was signed on June 28, 1919 at Versailles, France.. B. The Treaty of Versailles was signed on June 28, 1919, at Versailles, France.. C. The Treaty of Versailles was signed on June 28 1919 at Versailles, France.. D. The Treaty of Versailles was signed on June 28, 1919, at Versailles France.