Question

if blood is in short supply, which blood type would be the most beneficial to have on hand if someone needed a blood transfusion?
o+ o- ab+ ab-

Explanation:

Blood type O - is the universal donor. It can be given to people with any blood - type in a transfusion because it has no A, B, or Rh antigens on the surface of its red blood cells. So when blood is in short supply, having O - on hand is most beneficial as it can be used for a wide range of patients.

Answer:

C. O -