Step 1: Understanding the policy.
“Blood and Iron” policy referred to using war (blood) and industrial/military power (iron) to achieve national unification.
Step 2: Leader behind it.
Otto von Bismarck, the Chancellor of Prussia, advocated this idea to unify Germany in the 19th century.
Step 3: Checking options.
(A) Lenin – Russian revolutionary, not linked to this policy.
(B) Stalin – Soviet dictator, unrelated to this phrase.
(C) Bismarck – Correct, architect of German unification.
(D) Garibaldi – Italian nationalist leader, used armed struggle but not this phrase.
Step 4: Conclusion.
The “Blood and Iron” policy is related to Otto von Bismarck.