Milo Has Difficulties Speaking

Milo has difficulties speaking. Milo's therapist shows Milo various pictures, and says, "Point to the fork." If Milo correctly points to the picture of the fork, he receives a piece of candy whereas if he points to the wrong image, he is prompted toward the correct response. The therapist is using

A) receptive labeling training.
B) visual-spatial training.
C) socialization training.
D) discrete-trial training.