The normal range of the number of white blood cells in a microliter of blood is between _________ ?

A. 2,500 and 09,300
B. 4,500 and 10,000
C. 4,900 and 12,000
D. None of these

The normal range is 4,500 to 10,000 cells per microliter (cells/mcL). (A microliter is a very tiny amount – one millionth of a liter).