What were some of the noble strategies that the German army used during World War I, were they successful or not?

Germany's strategy was to defeat its opponents in a series of short campaigns. Germany quickly overran much of Europe and was victorious for more than two years by relying on a new military tactic called the "Blitzkrieg" (lightning war).

Explanation:

The answer is letter B. Monarchs in the Middle Ages encourage free trade among other towns.Either way both the townspeople and the monarch living in their area. This promotes a good tie between kingdoms, this also help keeping the towns in the Middle Ages free from invasions