We do not transmit low frequency signal to long distances because
(a) The size of the antenna should be comparable to signal wavelength which is unreal solution for a signal of longer wavelength.
(b) Effective power radiated by a long wavelength baseband signal would be high.
(c) We want to avoid mixing up signals transmitted by different transmitter simultaneously.
(d) Low frequency signal can be sent to long distances by superimposing with a high frequency wave as well.
Therefore, the most suitable options will be:

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(b), (c ) and (d) are true only

(a), (c ) and (d) are true only

All statements are true.

(a), (b), and (c ) are true only

answer is C.

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Detailed Solution

(a) For low frequency or high wavelength size of antenna required is high.
(b) E P R is low for longer wavelength.
(c) yes we want to avoid mixing up signals transmitted by different transmitter simultaneously.
(d) Low frequency signals sent to long distance by superimposing with high frequency.

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