B. You can be used as both. Here is an example. "You said you wanted this bear, so I got it for you." You is used as both a subject and object pronoun.
. Fire constructed the doorways, so there was no prospect of escape.
I would say tense and uncomfortable because "it was undoubtedly hot" "he began to sweat" "began to throb in his ears" the sweat and heat makes it very uncomfortable also, the rumbling and throbbing sound makes it tense.
hope this helps :D
