[单选题]
Radiation from the Sun reac fgygzjn1 cn 6x*ezor 7w/72h2hes the Earth (abo rc*kl(,qvcds5qi p+:wn0 e+bve the atmosphere) at a rate of about 5rps*w e+:(+ql c,vc0kbdiq n$1350 \; W/m^{2}$. Assume that this is a single EM wave and calculate the maximum value of the magnetic field.
A. $6.7 \; mT$
B. $4.8 \; mT$
C. $3.4 \; mT$
D. $2.4 \; mT$