The correct answer is D. In 1648, it was divided into a number of small kingdoms.
The year 1648 was the year in which the treaties of the Peace of Westphalia were signed, which put an end to the Thirty Years' War. This was a conflict between numerous kingdoms in Central Europe, including the Holy Roman Empire and many other European powers. The main cause was a religious conflict between Catholics and Protestants, but also territorial sovereignty of the different states became an important matter.
At that moment, Germany did not exist as a unique nation-state, instead, it was divided into a number of small kingdoms, like the Kingdom of Bavaria, the Electorate of Saxony, and the Holy Roman Empire. All these states clashed for religious and political differences but after the Peace of Westphalia, their sovereignty was much more delimited. Germany did not unify until the 19th-century under the rule of Otto Von Bismarck.
