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What is the use of a varactor diode in radio receiver?

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What is the use of a varactor diode in radio receiver?

(a) Demodulation

(b) Mixing

(c) Multiplexing

(d) Tuning

This question was posed to me in my homework.

I need to ask this question from Receiver topic in division Elements of Communication System of Analog Communications

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Correct answer is (d) Tuning

The explanation: Varactor diode is a diode working in the reverse-bias because of which no current flows through it. It has variable capacitance which varies with applied voltage. Varactor diodes are mainly used in Voltage Controlled Oscillators (VCOs) and RF Filters for tuning the receiver to the incoming signal or different stations.

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