Concept:The reflection of sound that reaches the listener after a short delay is called an echo.
Explanation:A person produces a sound, and this sound travels outward from the source.
When the sound wave strikes a hard, distant surface such as a wall or a cliff, it is reflected back toward the listener.
The reflected sound arrives after the original sound has already stopped.
For the reflection to be heard as a separate sound, the distance of the reflecting surface must be large enough to create a noticeable time gap.
This distinct, repeated sound caused by the reflection of one's own sound is known as an echo.
Reverberation is the persistence of sound due to multiple overlapping reflections, not a single distinct repetition.
Resonance is the amplification of sound when frequency matches the natural frequency of an object.
Audibility refers to the range or clarity with which a sound can be heard.
Therefore, the correct term for a reflected sound heard after the original sound has ceased is an echo.
Answer:C. echo