Why was otto von bismarck nicknamed the "blood and iron chancellor"?

a: he rejected war in favor of diplomatic solutions.

b: he received a disabling wound in battle.

c: he put political enemies into prison.

d: he was fearless and determined to use armed force.

Yeah D in the answer

D: He was fearless and determined to use armed force.

  I believe that the correct answer to the question is D he was fearless and determined to use armed force.

  Blood and iron was a name given to a speech Otto von Bismarck gave on 1862 when he was the Minister President of Prussia about the unification of the German territories. That speech was given by him under request of the King Wilhelm I after the Prussian House of Representatives refused the approval of an increase in military spending.

  Wilhelm I appointed Bismarck as Minister President and Foreign Minister and on Septemeber 30 he appeared before the House´s Budget Committee and underlined the necessity for military preparedness to solve the German Question. This was a debate over the best way to unificate the German Confederation after revolutions on 1848.

  The term Blood and Iron was used by Bismarck to make a point on the use of armed force to achieve the unification, he argued that speeches and majority decisions would not be the answer to the unification on the contrary the resolution would be with iron and blood.

  I will copy and extract of the speech made by Otto von Bismarck to be more specific the final part in which he used the term under study:

"Prussia must concentrate and maintain its power for the favorable moment which has already slipped by several times. Prussia's boundaries according to the Vienna treaties are not favorable to a healthy state life. The great questions of the time will not be resolved by speeches and majority decisions – that was the great mistake of 1848 and 1849 – but by iron and blood".

  The phrase "blood and iron"  (German: Blut und Eisen) became a popular way to describe the foreign policy of Bismarck because he did on ocassion resort to war in order to unificate the German region and expanse the continental power. Therefore he was known as the "Iron Chancellor".

  I hope the answer help you. Regards