Which event led to the decline of franz mesmer’s brand of hypnosis?

a. the advent of brain scanning technology
b. a scientifically controlled experiment
c. his own admission of fraudulent results
d. the publication of an expose by an assistant

B. a scientifically controlled experiment

Explanation: I just took the test and got it correct

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The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)