The correct sentence is 'una persona que escucha la radio es un oyente' (Option C).
The Spanish word 'oir' means 'to listen' in English (in this case, the person is a listener).
The correct translation for this sentence is 'an individual who listens to the radio is a listener'.
In conclusion, the correct sentence is 'una persona que escucha la radio es un. oyente' (Option C).
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