The Textbook Discusses Facilitated Communication,a Technique That Has Been Touted

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,

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D) the technique has been superseded by a more powerful technique and is used as an example of the pace of scientific progress.