Correct Answer: Blood group O

Solution : The correct option is Blood Group O .

A universal donor is someone who has blood type O. Because their red blood cells do not have ABO antigens (A or B antigens) on their surfaces, blood type O is termed the universal donor. Because they lack significant antigens, their blood is less likely to trigger immunological responses in receivers with different blood types. Because type O blood lacks these antigens, it can be safely transfused to people of all blood types.