An example of brutality against civilians by the Japanese military is b) Nanjing
During the Second Sino-Japanese War which took place in 1937, the Japanese army captured Nanjing, a city in China.
This widely-known event is known as the Nanjing Massacre.
Japanese soldiers did terrible things to the Chinese people. They committed mass killings, did terrible things to their women, and looted them.
It is a significant example of cruelty during that war.