[单选题]
An atomic nucleus has a ch kzlm* e5 akm 6 js7z0h79esyy ay3vav-ce.t/*arge.pu0sgy)+hgezvk6 q0 of $+40e$. An electron is $10^{-9} \; m$ from the nucleus. What is the force on the electron?
A. $2.9 \; nN$
B. $1000 \; C$
C. $3.7 \; nN$
D. $6.8 \; nN$
E. $9.2 \; nN$