Everything was metal , and there was no mattress . He got up to open the door , and found it locked or blocked or something from the other side . That meant , then , that someone played a trick on him . He almost took his shirt off and set fire to that , but he needed the warmth it provided , scant as it was . So , instead , he banged on the door .
Why is burning his shirt impractical in this situation ?
- He is not wearing a shirt
 - None of the above choices .
 - His shirt is made of a material that is hard to burn
 - The room is flammable and will burn


None of the above choices .