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What is the need of doing Pre emphasis?

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What is the need of doing Pre emphasis?

(a) For boosting of modulating signal voltage

(b) For boosting of modulating signal frequency

(c) For removing amplitude variations due to noise

(d) For removing frequency variations

The question was posed to me in homework.

I would like to ask this question from Coherent Detection of DSBSC Waves topic in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications

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Right answer is (a) For boosting of modulating signal voltage

Explanation: Pre-emphasis is vastly applied in communication systems to improve signal strength before transmission. It refers to boosting the amplitudes of the weak modulating voltages for high audio frequencies in the range of 2 to 15KHz.

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