A) This choice is incorrect because chronic leukemia can affect both children and adults, not just children and young adults.

B) This choice is incorrect because chronic leukemia progresses more slowly than acute leukemia and does not typically require immediate treatment.

C) This choice is correct. Chronic leukemia is characterized by the overproduction of mature and functional white blood cells. Unlike acute leukemia, the abnormal cells in chronic leukemia are more developed and functional, but they may not function correctly, leading to an accumulation of these cells in the blood.

D) This choice is incorrect because chronic leukemia usually presents with milder symptoms compared to acute leukemia. Hospitalization is not typically required unless complications arise.