Which of the following examples represents an echoic?

The correct answer reflects the definition of an echoic, which is a type of verbal operant that involves the repetition of words or phrases spoken by another person. In this case, when a child repeats "Good morning!" after a parent, they are engaging in an echoic behavior because they are mimicking the exact words that were just spoken to them.

This behavior demonstrates the child's ability to accurately reproduce vocal sounds in response to another's verbal prompt, showcasing the fundamental characteristics of echoics. Echoics are primarily characterized by the voluntary repetition of sounds and words, which is exactly what occurs in this scenario.

The other examples do not meet the criteria for an echoic. An instance of answering a question is more aligned with a tact or other verbal operant rather than mimicking sounds. Saying "Help!" represents a spontaneous verbal response to a situation that does not involve echoing someone else's speech, while describing a book is an example of a more complex verbal interaction rooted in language production rather than mere repetition.