An echoic is a verbal operant that is defined by three key features it is evoked by a verbal discriminative stimulus SD it has pointtopoint correspondence the beginning middle and end of the stimulus and response match and it has formal similarity the stimulus and response products are in the same modality typically auditoryauditory or visualvisual In the correct option A client hears the phrase clap hands and then says clap hands all three criteria are met the client hears a verbal SD clap hands the vocal response clap hands has pointtopoint correspondence with the vocal stimulus and there is formal similarity both are vocal Lets analyze the other options A client sees a picture of a cat and says cat is a tact as its evoked by a nonverbal SD A client is asked What color is the car and says red is an intraverbal as its evoked by a verbal SD but lacks pointtopoint correspondence with the stimulus the question What color is the car is different from the answer red A client reads aloud from a book saying the words The dog ran is a textual operant evoked by a nonvocal verbal SD written text and typically does not meet the criteria for an echoic unless the written word is simultaneously spoken by another person and the client repeats that spoken word