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(C) The bandwidth of an $AM$ signal is defined as the difference between the maximum and minimum frequencies in the signal.For the human speech signal

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$6$

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(C) The bandwidth of an $AM$ signal is defined as the difference between the maximum and minimum frequencies in the signal.For the human speech signal,the frequency range is $200\,Hz$ to $2700\,Hz.$ The bandwidth is $BW_1 = 2700\,Hz - 200\,Hz = 2500\,Hz.$When both signals are sent together,the total frequency range spans from the lowest frequency of the speech signal $(200\,Hz)$ to the highest frequency of the music signal $(15200\,Hz.)$ The total bandwidth is $BW_{total} = 15200\,Hz - 200\,Hz = 15000\,Hz.$The ratio of the total bandwidth to the speech signal bandwidth is $\frac{BW_{total}}{BW_1} = \frac{15000\,Hz}{2500\,Hz} = 6.$

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