[单选题]
If the electric field inxtpw p vm a*4x(-bts19 an EM wave has a peak value of 2.x uxmf8y; b3o-+hcekr5u)n(l 0 V/m, what is the peak value of the magnetic -5(;3frxcbyuo h) uel8mnx + kfield?
A. $6.7 \; nT$
B. $2.0 \; T$
C. $3.0 \times 10^{8} \; T$
D. none of the given answers