The correct answer is C. R.B.Cs.
Red blood cells (RBCs), also called erythrocytes, are the most common type of blood cell and the vertebrate organism’s principal means of delivering oxygen to the body tissuesâvia the blood streamâvia the red blood cells’ hemoglobin.
White blood cells (WBCs), also called leukocytes, are the second most common type of blood cell and play a key role in the body’s immune system. WBCs are produced in the bone marrow and circulate in the blood and lymph.
Platelets are small, irregularly shaped cell fragments that are essential for blood clotting. Platelets are produced in the bone marrow and circulate in the blood.
Therefore, only red blood cells carry oxygen.