[单选题]
An electron and a proton are oy v4 bea0f*3lseparated by a distance of 1.0 m. 0t3xl xgk,tg4n0 xq6dwua 7s/ What happens to the magnitude of the force on the first electron if a second electron is placed next to the protx0 txgkqd/,ws6a34 glnt70xuon?
A. It doubles.
B. It does not change.
C. It is reduced to half.
D. It becomes zero.
