Persons with the AB blood group are called universal recipients. This is due to:

The correct option is A

Absence of antibodies, anti-A, and anti-B, in plasma

The correct option is A.

Explanation of the correct answer:

1. Persons with the AB blood group have the genotype I^AI^B.
2. Due to this, they have no anti-A or anti-B antibodies.
3. Due to the absence of antibodies, the blood received from any donors will be accepted by these recipients.
4. Thus persons with AB blood group are called universal recipients.
5. This is an example of codominance.

Explanation of the incorrect options:

Option B:

1. There is an absence of antigens A and B in the plasma of persons with blood group O.

Option C:

1. There is a presence of antibodies, anti-A, and anti-B, on RBCs of persons with blood group O.

Option D:

1. There is an absence of antigens A and B on the surface of RBCs with blood group O.

Final answer: Persons with the AB blood group are called universal recipients. This is due to the absence of antibodies, anti-A, and anti-B, in plasma.