They were taken to a red brick building, which bore the letters "Baden," that is to say "Baths." There, to begin with, they were made to undress and given a towel before they went into the so-called shower room. Later on, at the time of the large convoys from Hungary, they had no more time left to play-act or to pretend; they were brutally undressed . . . . Once the people were undressed they took them into a room, which was somewhat like a shower room, and gas capsules were thrown through an opening in the ceiling. An SS man would watch the effect produced through a porthole. At the end of 5 or 7 minutes, when the gas had completed its work, he gave the signal to open the doors; and men with gas masks – they too were internees – went into the room and removed the corpses.

–Marie Claude Vaillant-Couturier,
1946

What does the eyewitness primarily describe in this part of her testimony?

the efforts to fool prisoners at a Nazi prison camp
the separation of prisoners at a Nazi death camp
the manner in which prisoners were executed at a Nazi death camp
the inhumane way that prisoners were washed at a Nazi prison camp