Concept:In the ABO blood group system, antigens are present on red blood cells, while antibodies are present in blood plasma.
Explanation:The surface of red blood cells carries antigens of type A or B.
Blood plasma contains antibodies that act against the antigens absent from the person's own red blood cells.
Option A is incorrect because antigens are not found on white blood cells.
Option C is incorrect because antibodies are not located on red blood cells.
Option D is incorrect because antigens are not present in blood plasma.
Thus, the only accurate statement is that antibodies are located in the blood plasma.
Answer:B. Antibodies are located in the blood plasma