Something that can be heard

The correct answer is C. Audible.

Something that can be heard is called audible. It is an adjective that means “capable of being heard”. The word “audible” comes from the Latin word “audire”, which means “to hear”.

The other options are not correct because they do not mean “capable of being heard”.

• Auditory is an adjective that means “relating to hearing”.
• Audio-visual is an adjective that means
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  “relating to both hearing and sight”.
• Audition is a noun that means “a trial performance of a piece of music or drama”.