What might be a problem if you receive a report that your audio signal through an FM repeater is distorted or unintelligible?
Why All three can produce garbled audio through a repeater. If your transmitter drifts slightly off the repeater input frequency, the repeater's discriminator recovers distorted audio. Speaking too loudly or with your lips against the microphone overdeviates the FM signal, splattering beyond the receiver's filter and clipping the recovered audio. And a poor location, meaning a weak or multipath-ridden signal into the repeater, makes the received audio noisy and broken up.
Watch out Each single choice is a real cause, so picking just one is incomplete; the pool includes an "all" option precisely because distorted repeater audio has several common sources.
Bad repeater audio: off frequency, over deviating, or out of range. Three causes, so pick them all.