[单选题]
A metal sphere of radiuswny z*3 8gx)ij5gz3x u8 ,3qhdsph vm42.0 cm carries a charge of 3.0 mC. What is the electric fieldhvp3m qh4, ds8 6.0 cm from the center of the sphere?
A. $4.2 \times 10^{6} \; N/C$
B. $5.7 \times 10^{6} \; N/C$
C. $7.5 \times 10^{6} \; N/C$
D. $9.3 \times 10^{6} \; N/C$