[单选题]
A proton and another objz*ri/.x uc r(fect with charge +e exert e0 n rg1 ql ii*9rr1gainnyy,3/8 qwj:ylectrical and gravitational forces on one another. To the nearest order of magnitude, what mass must the object have to bli 31jggy, 0n yw: q ari*rrq19yn/i8ne so that the net force acting on it is zero?
A. $10^1$ kg
B. $10^3$ kg
C. $10^6$ kg
D. $10^9$ kg
