Neutropenia Is a Quantitative Disease, Defined as an Absolute Neutrophil $\times$

Neutropenia is a quantitative disease, defined as an absolute neutrophil count of less than __________.

A) 1.0 $\times$ 10⁹/L
B) 1.2 $\times$ 10⁹/L
C) 1.5 $\times$ 10⁹/L
D) 2.0 $\times$ 10⁹/L
E) 5.0 $\times$ 10⁹/L