The Textbook Discusses Facilitated Communication, a Technique That Has Been

The textbook discusses facilitated communication, a technique that has been touted as allowing communication-impaired people to express themselves via a keyboard operated with the help of a facilitator.In fact, the technique

A) has been scientifically validated and is cited as an example of the successful application of ideas about automatic processing.
B) is controversial, with evidence both for and against its effectiveness, and is cited as an example of the limits of the scientific method.
C) was discredited since scientific evidence indicated that in fact, the facilitators unknowingly communicated their own responses rather than those of the other.
D) has been superseded by a more powerful technique and is used as an example of the pace of scientific progress.