For each paragraph put the italicized sentence into one of the three positions marked (A), (B), and (C). 2 The blood used in a transfusion must work with your blood type. Every person has one of the following blood types: A, B, AB, or O. (A) Also, every person's blood is either Rh-positive or Rh-negative. (B) So, if you have type A blood, it's either A positive or A negative. (C) If it doesn't, antibodies (proteins) in your blood attack the new blood and make you sick.