C. Japan's military vowed to keep fighting.
Astonishing as it can sound, the Japan military leaders kept loyal to ancient traditions and would rather die in battle than surrender.
In Japanese culture and belief system, the willingness to fight remains until the end. The Japan government knew that the war was lost for them already but they were unwilling to surrender. The Soviet Union put pressure declaring war as well and with the second bomb in Nagasaki, they continued to refuse and accept the defeat. Many isles and frontlines along the Pacific were still being defended harshly by the remaining Japanese divisions.
Again, the end of the war came more from the decision of the allies than actually, Japan admitting being defeated.