The correct answer is option 3, which states that blood transfusion is possible between blood groups A and AB.

To understand why this is possible, let`s look at the different blood types and their compatibility for transfusion.

Blood groups are classified based on the presence or absence of certain antigens on red blood cells. The two main antigens used for blood typing are A and B.

Group A blood has only A antigens on the red blood cells and B antibodies in the plasma. Group B blood has only B antigens on the red blood cells and A antibodies in the plasma.

Group AB blood has both A and B antigens on the red blood cells but no A or B antibodies in the plasma. Group O blood has neither A nor B antigens on the red blood cells but has both A and B antibodies in the plasma.

For a blood transfusion to be successful, the recipient`s immune system should not recognize the donor`s blood cells as foreign and mount an immune response. This means that the recipient should not have antibodies against the antigens present on the donor`s red blood cells.

In the case of option 3, blood transfusion is possible between blood groups A and AB because group A blood does not have antibodies against the A antigen and