Question

type o blood is known as the universal donor because it: a doesnt carry a or b antigens b can avoid antibody detection c produces both a and b antibodies

Explanation:

Blood type O has neither A nor B antigens on red blood cells. When transfused, these antigens won't trigger an immune response (antibody - antigen reaction) in recipients with other blood types (A, B, AB). Option b is incorrect as it's not about avoiding antibody detection. Option c is wrong because while type O has anti - A and anti - B antibodies, that's not why it's a universal donor. The key is the lack of A and B antigens.

Answer:

a. doesn't carry A or B antigens