Can a B negative woman marry any blood group type?

Absolutely - blood type does not limit the potential spouses for anyone. However, a B- woman chooses to have children with a man with Rh positive blood of any type (AB, A, B or O), she needs to be careful and let her doctor know that she may be carrying an Rh+ baby even though she is Rh-. The doctor can explain the potential complications, as well as what the doctor can do to prevent or minimize the potential for those complications.