Answer:
B.) The incident reveals how the increasingly dire situation is affecting people’s sanity.
D.) The incident conveys that Wiesel must be wary of danger posed to him by his fellow prisoners, as well as by the German guards.
In Night, Elie Wiesel recounts his memories of the concentration camps in which he was a prisoner from 1944-45. When telling the incident of the man attempting to strangle him, the author is trying to introduce two themes. First, the author wants to show how horrible situations, such as being in a concentration camp, can so affect people that they start behaving in cruel and irrational ways. Second, the author wants to show how, while being in the camps, you needed to be aware of the danger posed by both the guards and your fellow prisoners.