A) it was the home of the emperor and his family
Yes.
Although the constitution does not mention the issue of secession, The Supreme Court has consistently interpreted the Constitution to be an "indestructible" union. The states cannot leave the Union. There is no legal basis a state can point to for unilaterally seceding.
Rhineland is the name used for a loosely defined area of Western Germany along the rhine river. Hitler wanted it to test British and French allies. French Army, Navy, and airforce outnumbered the German Armed forces.
The group of Muslim Arabs <span>most threatened the Byzantine Empire in 1050</span>