Typesetting a new condo owner's manual in English and French which includes some measurements in inches. Client says the fractions must be typeset as in B.
I'm almost dead certain you never set fractions with a hyphen in English text, unless there's a convention about doing this in the building trades that I don't know about. I would always set a number and fraction together as in A.
I'm not as dead certain about French. This is in Quebec, not France (where of course this would be metric and so much simpler).
(I am also reminded those should be double primes, not close quotes. But they're not the issue.)
I've looked long and hard for French typesetting norms but this specific circumstance isn't covered by anything I've found.