[单选题]
An electron and a proton are sn8b px-ikd3 rbeu (d7+eparatex(,:i7 zcigo ld by a distance of 1.0 m. What happens to the magnitude of thgi 7(ilz:, coxe force on the first electron if a second electron is placed next to the proton?
A. It doubles.
B. It does not change.
C. It is reduced to half.
D. It becomes zero.
