An electromagnetic wave having frequency f₀ gets attenuated by a factor of e^-2 after propagating a distance d in a good conductor. If the signal frequency is now reduced to 0.5 f₀, after travelling the same distance d in the same conductor, the signal will get attenuated by a factor of:

A. e^-4

B. e^-2√2

C. e^-√2

D. e^-1

Answer: Option C