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I think the reason we all got caught up in picky minutiae is that
the question seems like it can't possibly hold any interest
absent the effects of minutiae.
Now, however, I think we have a fairly well-defined question.
I'm not sure what a "massive run away planet" is, but assuming
the intent is to distinguish between a position at the center of
a cavity in a gravitating body in free space and that same
position minus the gravitating body, I'll choose C; no
difference. I suspect that isn't literally true general
relativistically, but I'll trust Hasan's implication that he
isn't interested in such quibbles.
John Mallinckrodt
Cal Poly Pomona