20. germany was punished for wwi in all
a had to pay reparations
b. had to disarm a majority of their military
c german leader kaiser wilhelm was executed
d. had to give up land

A, B, and D.

Explanation:

After World War I, the blame for the war was put entirely on Germany. Germany was not happy with this, and saw themselves as accountable as everyone else. The Treaty of Versailles was incredibly harsh on Germany, they could now only have 100,000 armed troops with 6 navy ships, had to give up the land they had gotten during World War I to France, and had to pay millions of dollars in reparations for the war. When Adolf Hitler came into power after World War I, he pushed the boundaries of the Treaty of Versailles and violated it completely. It would not be option C, as Kaiser Wilhelm was not executed, and died from other circumstances before Germany even lost World War I.

a case involving the laws of a single state.