Why would the soviet union have ordered an invasion of japanese held manchuria two days after the atomic bombing of hiroshima

Japanese inner supreme war council refused to surrender.

Explanation:

Even after the atomic bombing on Hiroshima half of the Japanese inner council also know by the supreme war council refused to surrender unless guaranteed japan's future by the allies.

The Japanese army was sure and believed that they would not have to engage with the soviet army until 1946 and the Japanese army went too far in east-front where they are fighting with Germans but the soviet army surprised them by the invasion of Manchuria.

The soviet invasion to Manchuria was a swift attack in which 850 soldiers of japan army engaged and 650 killed or get wounded with in the first two days of fighting.

b is the answer i am assuming