A 2013 Study Examining the Administration of Hypnosis to Golf

A 2013 study examining the administration of hypnosis to golf professionals for a period of 7 days to improve their golf score found:

A) that hypnosis intervention worsened golf performance.
B) that hypnosis intervention did not improve golf performance.
C) an overall improvement in performance per mean number of strokes during the intervention phase.
D) an overall improvement in performance per mean number of strokes during the baseline measurement.