A behavior analyst is asked to provide direct services requiring daily 1:1 interaction with a teen-aged client. The clie

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A behavior analyst is asked to provide direct services requiring daily 1:1 interaction with a teen-aged client. The client does not speak but can communicate fluently using sign language. The behavior analyst knows some sign language but is not fluent. The BEST approach to this situation would be to

A. explain his level of competence in sign language to the family before beginning service.
B. hire a sign language interpreter to attend the sessions.
C. attend a workshop in sign language prior to beginning service.
D. refer the family to a behavior analyst fluent in sign language.