Du and Greer (2014) found that 2- to 4-year-old children with autism who failed to learn generalized imitation in face-to-face interactions were successful in establishing generalized imitation when:
A) The modeled action was shown on a video
B) A mirror was used to display the modeled action
C) A puppet was used to show the modeled action
D) The modeled action was shown by a 2- to 4-year-old model