[单选题]
An electron and a pr3mt* o66,lnfjxe)o+d /w x lcie.(;vu9l p jproton are separated by a distance of 1.0 m. What happens to the magnitude of the force on the protonpv. ;upr(jl 9e if a second electron is placed next to the first electron?
A. It quadruples.
B. It doubles.
C. It will not change.
D. It goes to zero.