A medical condition in which there are too many RBCs is:

A) anemia.
B) leukemia.
C) polycythemia.
D) septicemia.

Polycythemia is a condition characterized by the excessive production of red blood cells (erythrocytosis) in the bone marrow, leading to an increase in hematocrit and viscosity of the blood. Anemia is a condition characterized by a low RBC count or low hemoglobin level. Leukemia refers to a group of blood cancers characterized by the uncontrolled production of abnormal white blood cells. Septicemia refers to a bacterial infection of the bloodstream.