Ahistorian criticizing harry truman for his decision to drop the atomic bomb would most likely disagree with which of the following policies?

a. detente
b. unconditional surrender
c. containment
d. the truman doctrine

He would most likely criticize b - unconditional surrender. 

Unconditional surrender happens when a country has been so depleted and devastated it has no other choice but to surrender and stop fighting their enemy. In the modern world this would only happen in the case when some devastating attack would take place on either country in the war (in the case of the atomic bomb that was considered to be the devastating attack which left the Japanese with no other option). 

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