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If the electric field in a plane electromagnetic wave is along the y axis and its...

If the electric field in a plane electromagnetic wave is along the y axis and its component is given
by Em sin(kx + ωt), in SI units, then the magnetic field is along the z axis and its component
is given by:
A. (Em/c) cos(kx + ωt)
B. −(Em/c) cos(kx + ωt)
C. −(Em/c) sin(kx + ωt)
D. Em cos(kx + ωt)
E. (Em/c) sin(kx + ωt)

how and why b is wrong

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