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I'm not sure how this fits into the discussion given below; and I don't think it contradicts anything.
But I believe that it is still the case that no one has offered up a self-consistent quantum theory of gravity in the "usual" sense of QFT (standard quantum field theory). Some string theories are believed (shown?) to be quantizable in a self-consistent manner.
While this may not change the opinion that scenario A is preferable (in the sense of community consensus indicating that it is the most likely situation); it does provide some basis for believing that nature may provide more interesting physics along the lines of scenario B.
Comments offered up for discussion and criticism.
Joel