[单选题]
A proton and another object w2ey5vax)fr i2 fi* y1iith charge +e exert electrical 9/h*tcdnyd7rw s/7pi and gravitational forn * /iywd/rhs7pcd79 tces on one another. To the nearest order of magnitude, what mass must the object have to be 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
