Children in a Gymnastics Class Do Many Exercises, Including Some

Multiple Choice

Children in a gymnastics class do many exercises, including some exercises that are done on individual mats. When the instructor blows a whistle twice, the children bring their mats and spread them in neat rows on the floor. The instructor's blowing the whistle twice is _____________.

A) the operant stimulus
B) stimulus discrimination
C) the discriminative stimulus
D) the operant discriminator