The men are filled with joy as the bombs fall around them because they want the Germans to be defeated. Wiesel mentions how they've heard the Germans were losing some battles, but this was the first time they had proof. This shows that they "no longer fear death". They have been living with so much death that it is a regular occurrence. Also, a death that is caused as a result of Germany's defeat is better than a death at the hands of the Germans.
The plural form of roof is roofs.
Although there are many words where f would become v, like in hooves, this is not one of those cases.
B. One of your troop members began to cry.
It doesn't explain why he is crying, and is the most suspenseful, but one could argue it was C, because they could have going the wrong direction, but B is the most suspenseful due to the crying and emotion in it.
Hope this helps, even though I just debated aloud.
