Which Seatpost clamp do I need?

A - (34.9mm) fits Following V1, Insurgent V1, Calling, Following MB (V2), Insurgent LB (V2), Offering (V1), Following (V3), Wreckoning (V3), Offering (V2), Insurgent(V3), Epocalypse, Following LS, Wreckoning LS, Offering LS, Insurgent LS, Chamois Hagar

B - (38.9mm) fits Wreckoning (V1), Wreckoning LB (V2)