The correct answer is B. B and O.
Blood type is determined by the presence or absence of certain antigens on the surface of red blood cells. There are four main blood types: A, B, AB, and O. People with type A blood have the A antigen on their red blood cells, people with type B blood have the B antigen, people with type AB blood have both A and B antigens, and people with type O blood have neither A nor B antigens.
In addition to the A and B antigens, there is also an Rh factor, which can be either positive or negative. People with the Rh factor are Rh-positive, and people without the Rh factor are Rh-negative.
When a person receives blood from a donor with a different blood type, their immune system may attack the donor’s blood cells. This can lead to a serious condition called transfusion reaction.
To avoid transfusion reactions, blood donors and recipients must be matched for blood type and Rh factor. People with type B blood can donate blood to people with type B blood and type O blood. People with type O blood can donate blood to people with any blood type.
I hope this helps! Let me know if you have any other questions.