[单选题]
A metal sphere of radius 10 /flx30,fz4e ufvd my /cm carries a charge of +2.0 mC. What is the magn bbkp d7kvdya,,x 2b*e2iq p90itude of0 xpa pe92qd*,yb 2ibv7b ,kkd the electric field 5.0 cm from the sphere's surface?
A. $4.0 \times 10^{5} \; N/C$
B. $8.0 \times 10^{5} \; N/C$
C. $4.0 \times 10^{7} \; N/C$
D. $8.0 \times 10^{7} \; N/C$