[单选题]
The charge carried byx x k) 4u-esnz hf++mict62;km one eb/whb -8ymln)tpdu4 9lectron is $e = -1.6 \times 10^{-19} \; C$. The number of electrons necessary to produce a charge of $-1.0 \; C$ is
A. $6.25 \times 10^{18}$
B. $6.25 \times 10^{9}$
C. $1.6 \times 10^{19}$
D. none of the given answers
