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What causes a new signal with frequency fs-fm to be created near the original signal?

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What causes a new signal with frequency fs-fm to be created near the original signal?

(a) Attenuation

(b) Imaging

(c) Aliasing

(d) Distortion

This question was addressed to me during a job interview.

This question is from Data Conversion in portion Digital Communication Techniques of Avionics

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The correct option is (c) Aliasing

To elaborate: Aliasing occurs when a signal is sampled mistakenly at a frequency lesser than twice the input frequency. It causes a new signal with a frequency of fs-fm to be created near the original signal.

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