Experimentation with the Application of Noise or Metronomic Rhythm to Stuttering

Experimentation with the application of noise or metronomic rhythm to stuttering therapy has indicated that:

A) the two methods yield substantial long?term cure or near-cure (stuttering on 1% or less of syllables) during unaided speech in 75% of the clients
B) the two methods yield only short?term, though substantial, results in the majority of the clients
C) the two methods yield only minor improvement, either short or long term in about 75% of the clients
D) none of the above is a reasonable/accurate conclusion on the basis of present data