This belongs to the work “Night” written by Elie Wiesel and published in 1956.
The correct answers are B and D.
In the case of B, the incident shows that while some are driven to cruelty by their circumstances, others take great risks to show kindness. An example of these two is when Elie was savagely beaten by Idek. The french girl conforting Elie is an example of kindness and Elie being beaten and having to go to work later is an example of cruelty.
In the case of D, the incident demonstrates how violence is an ever-present threat for everyone. This is reflected by the development of the theme of violence in different forms throughout the story. Many forms of violence were used to threaten people, and there were many abuses from the Germans to the Jewish.