Which of the following can eliminate distorted voice transmissions?

Distorted voice transmissions are frequently caused by RF feedback, a condition where your own transmitted radio frequency energy travels back down the microphone cable and interferes with the radio's sensitive audio circuitry. Adding a clip-on ferrite choke to the microphone cable easily solves this issue. The ferrite acts as an RF choke, blocking high-frequency RF currents from traveling along the outside of the cable while allowing your low-frequency voice audio to pass unimpeded. Distractors involving the squelch are incorrect because the squelch control only affects the receiver, not your transmitted audio.