An hypnotist is the professional that can advice Deloris on how to improve her ability to concentrate when she is reading.
This is a psychological inclined person that uses hypnosis as a form of treatment or entertainment.
Because the hypnotist helps one into a deep state of relaxation, it is is the professional that can advice Deloris on how to improve her ability to concentrate when she is reading.
Therefore, the Option B is correct.
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