nude-dark (option B; preferred?)

Yes, I agree. Option B is the better one.

...being the model as is here, ie rendered in high contrast, but on a lighter foreground?

What I'm mostly concerned about is how shadows in the model will print; there's little detail in them, so it might be better to block them out altogether (?), especially that contrasty pictures often have stronger visual impact, perhaps because they are more abstract and thus come across as more "artistic" than "realistic".

At the same time, I feel persuaded by Rob Polder, who wrote I like to see her shadow on the floor bound by slightly lighter grey in his feedback on option A (being everything lighter tone, both the model and the foreground).  It seems to me that a lighter foreground accentuates the model -- while the darker one "drowns" her -- so this might be just the combination I was searching for: fourth time lucky?  ;-)

This one seems to have the most information in the highlights it does... I think I'd go with this one.