All of the Following Are True Regarding Selective Mutism, Except

All of the following are true regarding selective mutism, except

A) the disorder is classified under the anxiety disorders due to its close resemblance to social phobia.
B) children with the disorder choose to not speak in certain situations.
C) onset for the disorder is most frequently seen around 4?5 years of age.
D) the disorder represents a persistent refusal to speak in some social situations.