[单选题]
If the electric field .mxhv q9v( dc3in an EM wave has a peak48: 4: auir dp(l gi4dl4vy:tc,xh cyz value of 2.0 V/m, what is the peak(dx:hyci:,g zip vudl8: 4 cty4ra l44 value of the magnetic field?
A. $6.7 \; nT$
B. $2.0 \; T$
C. $3.0 \times 10^{8} \; T$
D. none of the given answers
