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I believe C is true because when frequency decreases, the wavelength increases (it sort of drags out the wave). This in turn decreases the slope of the wave which correlates to the extent of change in the electrical field. Hope this helps!
You can eliminate B since the wavelength of the radiation would increase if frequency decreased, for D the energy of the radiation would decrease not increase if the frequency decreased. Since speed is a constant A can be ruled out as well. That leaves us with C.
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