Which of the Following Has NOT Be Shown to Be

Multiple Choice

Which of the following has NOT be shown to be an outcome of the regular use of meditation?

A) the development of self-awareness, maturity, and psychological skills, such as clarity and concentration
B) the relief of a variety of psychological disorders, from insomnia to excessive anxiety
C) a reduction in aggression and in the use of illegal psychoactive drugs
D) an effective treatment for the sleep disorders of sleep apnea and narcolepsy