Anyone who has lost the faculty of speech because of significant stres

Anyone who has lost the faculty of speech because of significant stress is offered hypnotherapy. However, only 90 percent of these patients can talk again after treatment. Obviously, it can be concluded that doctors are not always honest with their patients and sometimes knowingly offer hypnotherapy to people whom it will not help.

Which of the following, if true, would most weaken the argument above?

A) All patients who agree to undergo hypnotherapy following loss of the faculty of speech because of significant stress are warned about possible complications or dangers.
B) Sometimes people who have lost the faculty of speech because of stress can benefit from hypnotherapy even if it does not help them regain speech.
C) Many have lost the faculty of speech but never experienced significant stress.
D) Hypnotherapy is often used to determine whether a person is faking or has indeed lost the faculty of speech.
E) There is no sure way to determine whether hypnotherapy will help return the faculty of speech to a particular person who has lost it because of significant stress.


Source: GoGMAT / OptimusPrep