Lia has been exhausted lately and keeps getting sick. She finally goes to see her doctor because she can´t get over a common cold. Her doctor diagnoses her with pneumonia and sends her to the hospital. While in the hospital, the doctors decide to check her white blood cell levels. Lia´s white blood cell counts are less than half of what they should

Sounds like Leukemia

Explanation:

Leukemia usually involves the white blood cells. Your white blood cells are potent infection fighters — they normally grow and divide in an orderly way, as your body needs them. But in people with leukemia, the bone marrow produces abnormal white blood cells, which don't function properly.

your answer will be a. sorry if im wrong: )