Which modulation technique is most commonly used in FM radio broadcasting?

Frequency Modulation (FM) is the correct choice for the modulation technique most commonly used in FM radio broadcasting. FM works by varying the frequency of the carrier wave in accordance with the amplitude of the audio signal being transmitted. This method is particularly effective for radio broadcasting because it offers improved sound quality and noise resistance.

When an FM signal is transmitted, the frequency deviation from the carrier frequency corresponds to the amplitude of the audio signal, which allows the receiver to accurately reconstruct the original signal with less susceptibility to interference. This makes FM well-suited for high-fidelity audio transmissions, such as music and voice, which are critical for radio stations.

In contrast, Amplitude Modulation (AM) is used for traditional AM radio but is more prone to noise and interference, such as static and fading, which can detract from audio quality. Phase Modulation is less common in FM broadcasting and is often used in data transmission rather than audio broadcasting. Digital Modulation is gaining traction in newer broadcasting technologies but does not traditionally feature in classic FM radio systems. Thus, Frequency Modulation is the definitive technique for achieving the clarity and reliability required in FM radio broadcasting.