Answer:
B: Otto von Bismarck
Step-by-step explanation:
Otto von Bismarck became chancellor of Prussia in 1862. He became the mastermind of the unification of Germany in 1871. The idea for unification became necessary as Germany was ruled by several small city-states which were ruled by princes and rulers. A sense of nationalism led Bismarck to build a nation by uniting. Bismark recognized the appeal of nationalism and used it to expand Prussia's power over other German states and to strengthen Prussia's voice in European affairs. To Bismarck, a war between Austria and Prussia appeared necessary to extend Prussia dominion over the other German state. Germany got its unification in 1871 with the aid of the Prussian Army.