The need for modulation is

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(C) Modulation is the process of superimposing a low-frequency baseband signal onto a high-frequency carrier wave. This process is essential because l

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to transmit audio signal to large distances

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(C) Modulation is the process of superimposing a low-frequency baseband signal onto a high-frequency carrier wave. This process is essential because low-frequency signals cannot be transmitted efficiently over long distances due to the requirement of impractically large antenna sizes and high signal attenuation. By modulating the signal,it can be transmitted over large distances with minimal loss and smaller antenna requirements. Therefore,the correct option is $C$.

Column $A$	Column $B$
$A$. $D$-layer	$I$. $250-400 \ km$
$B$. $E$-layer	$II$. $170-190 \ km$
$C$. $F_1$-layer	$III$. $95-120 \ km$
$D$. $F_2$-layer	$IV$. $65-75 \ km$

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