Otto Von Bismarck, the Prussian-Born Leader of German Unification

Otto von Bismarck, the Prussian-born leader of German unification,

A) instituted the Zollverein, the German customs union that drove industrial development.
B) followed a rigid plan for national unification at all costs.
C) was a liberal from lower class origins who used politics to achieve his reform goals.
D) practiced Realpolitik in conducting domestic and foreign policy.
E) relied upon the diplomatic and military support of the Habsburgs in the Austro-Prussian War.