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What is the function of feedback resistor?

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What is the function of feedback resistor?

(a) To increase voltage gain

(b) Reduce distortion

(c) Decrease collector resistance

(d) Decrease input impedance

The question was posed to me during an interview for a job.

My question comes from Voltage Amplifiers topic in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct choice is (b) Reduce distortion

To elaborate: In a negative feedback amplifier, when emitter feedback resistance is increased, the magnitude of the gain of the amplifier reduces;   but remains stable. Since the gain reduces the distortion and the noise in the signal is also reduced; as the overall signal we get at output is the input signal multiplied by the gain of the amplifier.  Therefore, feedback in an amplifier helps in reducing distortion.

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