Scenario A looks more likely to me. No one died, and I doubt the Cylons gave us a night off just out of the goodness of their warm hearts. No... they tried to take one of us out and failed. Roslin was a prime target; a high priority to be protected, especially after Caprica turned town. That means Roslin's assertion wasn't contradicted, and if Dee is a Cylon, those bucketheads would just be itching to take her out, however bad it looks.

Even if the toasters knew she wasn't a threat, a town protector wouldn't know that. Who else would the protector protect? Who else had a target on their backs? And what, the Cylons just so happened to attack them as well? That would be quite the lucky break.

I've been doing this too long to believe in lucky breaks.