meaning of sentence

(A) is posing the two actions as simultaneous but not necessarily related. Your sitting in the room happened at the same time as applicant's interview.

(B) could mean the same thing because while can mean during, but it could also mean something different because in some contexts while can also mean whereas or although. Thus, (B) could be implying that the two actions are contrary or mutually exclusive: either one of you could have been chosen for the interview, but in the end it was the applicant who was given the interview and you were left to do nothing but sit still in the next room.

Re: meaning of sentence


For your purposes, they are both correct, and both have the same meaning.

"I sat still in the next room" is an unusual phrase, however.
"I sat in the next room" would be normal.