An infant,blood type B, is born to a mother of blood type B,possible genotypes for the father are?

By looking at it..im gonna say E... try making a Punnet square so that you can test all the alternatives.. even though having a type A as ans answer may seem unprobable but if you have AO X BB there is a probablity of having AB 50%, and BO50% (type BO is the same as type B)... so go ahead and have fun making all the crosses.... =)