It’s (b) sorry for answering late
Answer:
Since Hiroshima is based on the real-world event during World War 2, the human rights issue that is explored in the novel is surrounding the casualties brought on by atomic bombing. ... The Hiroshima bombing was a wartime tactic that eventually forced Japan to surrender.
The northern tower (first) was hit at 8:46 am.
The southern tower (second) was hit at 9:03 am.