The ACC Has TWO Teams In BCS Bowls?

Please explain this to me, because I'm at a loss to understand how this makes any kind of logical sense within its presumed context:

Team A: Ranked 5th prior to its conference championship game, gets shellacked by 28 to a team ranked 20th, all while playing in a very mediocre conference.

Team B: Ranked 13th prior to its conference championship game, loses a squeaker by 3 to a team ranked 15th, all while playing in a better conference.