The correct options are
A Princes of the German states
C Representatives of the army
D Prussian ministers
On 18 January 1871, a huge assembly gathered in the magnificent Hall of Mirrors in the Palace of Versailles. The assembly included the princes of the German states, representatives of the army and important Prussian ministers. They gathered to attend the ceremony proclaiming the new German Emperor Kaiser William I of Prussia. Germany was declared a nation-state after this event.