Why Is Type O Rh-Negative the "Universal Donor

Multiple Choice

Why is type O Rh-negative the "universal donor"?

A) No surface markers are present on the O Rh-negative blood cells to react with the recipient's immune system.
B) Three surface markers are present on the donor blood cells (A,B,and O) that are recognized as compatible in all recipients.
C) Three surface markers are present on the donor blood cells (A,B,and O) ,which block immune reactions in the recipient.
D) The O and Rh surface markers on the donor red blood cells block immune reactions in the recipient.
E) More people have type O blood than any other blood type.