You are only allowed to apply for one tag during the first round. So pick either 2A or 2B for the first round. Choose the one that you think you will be hunting more is my suggestion. Or the one with fewer tags offered. Then if there are still tags available for the first round unsold tags, you can apply for the other WMU. It seems to me 2B is one of the WMU that always have lots of tags so you should be able to get one on the second round (first round unsold). Check out the PGC website for more details....
www.pgc.state.pa.us......
Remember to fill out everything on the form and the envelope.....hope this helps.
Heres a link to get you started....
http://www.pgc.state.pa.us/pgc/lib/pgc/digestpdfs/2006/deer_season.pdf
....third page on down to the end.