Mister MicawberNo doubt both are in use on teachers' rooms' doors around the country, but I would choose A, since there are several teachers.
Mister MicawberWell, 'mens' wouldn't be the plural functioning as an adjective, would it? That would be 'men room'.
If I were to say:
I pulled one of the pupils' chairs over.
Would you say that was correct? Or would pupil's be the right choice?
Thanks
Ryan
one pupil's chair