Nicolas Has Autistic Disorder and He Was Mute

Multiple Choice

Nicolas has autistic disorder and he was mute. A therapist working with Nicolas initially gave him a piece of chocolate any time he made a sound with his lips. This slowly changed until Nicolas only received a piece of chocolate for saying complete words, and eventually only for saying complete sentences. In this example, Nicolas developed speech skills through the use of

A) classical conditioning.
B) modelling.
C) shaping.
D) negative reinforcement.