He took another pull at his beer. (from OALD)

1. interpretation: Is A or B right?
A. He drank only one glass of beer, that is, his beer (in the glass). Not two or three, etc. glasses are implied.

B. He may have drunken several glasses of beer in a bar, if his beer meant several glasses of beer.

2. Does the sentence apply to cases in his home, or to those outside his home, e.g. in a bar?

Thanks in advance