[单选题]
A metal sphere of radius 2.0 cm carries a charge of 3.0 mxe x-jgv fg3b .i+1mi7C. ef h.j e3p1.il What is the electric field 6.0 cm from the cenlfe.eh p13i .jter 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. $9.3 \times 10^{6} \; N/C$
