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.

He was fearless and determined to use armed forces. they nicknamed him this because of his speech in which he said " 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".