You might less confident in yourself
Otto Von Bismarck was nicknamed the Blood and Iron Chancellor because HE PREFERRED TO USE ARMED FORCES. The correct option is D.
Otto Von Bismarck was called the Iron Chancellor as a result of his strict policies. One of his strict policies is his absolute belief in using armed forces and military operations as at when needed. Otto was a German, who has served as Chancellor under different government in Germany. He had the vision of uniting the German northern states and to weaken Austria and to make Berlin the center of German culture.
Answer:
Cement because it's man made the others are not.
