The safest 'grain' for B-types in General is Millet as it is a Beneficial.
Quinoa, Spelt is a Neutral as well.
Depends on your 'secretor status' to get more details...
I believe pregerminating your Brown Rice will make it safer for B's
Black-Eye Peas, Mung, Lentils are Avoids
Fava,Haricot(White), Kidneys, Lima are Neutral
Once again, knowing your secretor status will gain more Beneficials...