4fold to win (5fold high odds option):
Bournemouth
Leeds
Nottingham
Wolves
Cambridge Utd (High odds option)
Cup games are always unpredictable but i think the first four teams are strong win choices on paper and this 4fold will give decent odds of around 5/1.
Choose to add the option of Cambridge Utd, who are the kind of confident in-form underdog that could spring an upset against Birmingham, and the odds go up to around 30/1. If placed with Betfair you'll get your stake back as a free bet if only 1 of the 5 teams lose.