Assigned, Vectored, Expected-Filed

If your filed IFR plan routing goes through the Bravo, and you are cleared to destination as filed, then you can go through the Bravo. If you went NORDO five minutes after takeoff and there was no suitable/reasonable place you could go VFR, then you could go to destination, even if it required an alternate, being NORDO, you could still proceed to destination as long as it was legal to file in the first place.