Thats a very interesting question. Unfortunately I am the LBS, not the WAS so I cant tell for certain which one you should try.
But I do think option B is doomed. I wouldnt go there at all. Even if its only a joke, I dont think now is the time for such antics.
I think options A & C are the best, but they could easily backfire. She may very well be waiting for you to make the move and if you go dark (wait for her to make the move) she, like you said, may feel hurt by your apparent lack of interest.
And if you do the friendship thing, she may appreciate the gesture, however if she was waiting for you to be more romantic or something, she may still feel somewhat disappointed.
I guess the safest pick would be option C. But I am very interested to hear what a WAW has to say
Me: 37 Wife: 40 Son: 7yo Son: 18 mo Bomb: 12/31/07 Status: Reconciled 1/2009 but backsliding terribly right now