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What is the role of the capacitor in the following circuit?

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What is the role of the capacitor in the following circuit?

(a) Increasing the gain

(b) Decreasing the gain

(c) Has not role

(d) Decreases the output impedance

This question was addressed to me in an interview for internship.

This interesting question is from MOSFET Amplifier with CS Configuration in chapter FET Amplifiers of Analog Circuits

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Right choice is (a) Increasing the gain

Easiest explanation: We note that this circuit is an example of a degenerated C.S. stage. If the impedance connected at the source terminal is very low, the voltage gain of the circuit increases. The capacitor is called a bypass capacitor as it helps to provide a path of much less resistance than R5. The magnitude of capacitance can be controlled, to an extent, according to the frequency of operation.

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