rome, along with almost every civilization in the worlds history cannot create and manufacture all its needed goods so they needed allies to help them do so. also with them trying one of their allies got to close. so close that they took advantage of them and then defeated them thus ruling both their old and new land.
It's to avoid the full power of a monarchy.
If I'm right feel free to drop a follow~!
The answer is that it is b because
In 1871 two new major states of Europe had been formed—the German Empire and the kingdom of Italy. The new German Empire, under the hand of Otto von Bismarck<span>, was steered carefully, always with an eye upon France, for the Franco-Prussian War (1870–71) had left France thirsting for revenge and for recovery of the lost provinces of Alsace and Lorraine.</span>
