[单选题]
If the electric field f:r0gse)yb j0, rv 2dvin an EM wave r+pt) l5w//ewesb 6k shas a peak value of 2.0 V/m, what is the peak value of/lk / w5betrw6e)pss+ the magnetic field?
A. $6.7 \; nT$
B. $2.0 \; T$
C. $3.0 \times 10^{8} \; T$
D. none of the given answers
