[单选题]
An atomic nucleus has a charge o rtx 2/gxg o0uogk-50hf /d v;,5vffnlsl:gek /+40e. What is the magnitude of the electric field at a disfekndfl/ l:/v5s, v g;tance of 1.0 m from the nucleus?
A. $5.6 \times 10^{-8} \; N/C$
B. $5.8 \times 10^{-8} \; N/C$
C. $6.0 \times 10^{-8} \; N/C$
D. $6.2 \times 10^{-8} \; N/C$
