The correct answer is D. Blood group O has no antigens A or B.
Blood type is determined by the presence or absence of antigens on the surface of red blood cells. There are four main blood types: A, B, AB, and O. Blood type A has the A antigen, blood type B has the B antigen, blood type AB has both the A and B antigens, and blood type O has neither the A nor the B antigen.
The Rh factor is another antigen that can be present on red blood cells. People who have the Rh factor are Rh-positive, while people who do not have the Rh factor are Rh-negative.
Blood type is important because it can affect how a person reacts to a blood transfusion. If a person receives blood that is not compatible with their blood type, their body can reject the blood, which can be life-threatening.
It is important to know your blood type and Rh factor in case you need a blood transfusion. You can find out your blood type by having a blood test.