A Child's Parents and Teachers Report That He Impulsively Interrupts

Multiple Choice

A child's parents and teachers report that he impulsively interrupts others dozens of times each day,and that he cannot remain quiet when told to do so.When he notices a behavioral assessor visiting his classroom,however,the child doesn't say a word.This phenomenon is best described as

A) poor construct validity.
B) reactivity.
C) observer error.
D) controlled observation.