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I think it would be (D) to treat a variety of psychiatric disorders that involves the passing of 800 milliamperes of electricity through the brain, is now administered sparingly, because it engenders
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Bunuel
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Electroconvulsive therapy, a longstanding method for treating a variety of psychiatric disorders involving the passing of 800 milliamperes of electricity through the brain, is now administered sparingly, because it engenders considerable controversy due to its association with now outdated and unreliable forms of psychiatric treatment.
 


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Bunuel
(A) for treating a variety of psychiatric disorders involving the passing of 800 milliamperes of electricity through the brain, is now administered sparingly, because it engenders
psychiatric disorders involving the passing of 800 milliamperes....this makes you feel that the disorder involves passing 800 milliamperes through the brain. Whereas, the method involves passing the current.
Option A changes the meaning, therefore, Option A is out.

Bunuel
(B) for treating a variety of psychiatric disorders, involves the passing of 800 milliamperes of electricity through the brain and is now administered sparingly because it engenders
Here the statement becomes "Electroconvulsive therapy, a longstanding method for treating a variety of psychiatric disorders, involves the passing of 800 milliamperes of electricity through the brain and is now administered sparingly because it engenders considerable controversy due to its association with now outdated and unreliable forms of psychiatric treatment."
Electroconvulsive therapy involves is correct.
However, there is no comma before "and" and "because".
Secondly, we don't know to whom this "it" is referring to. Is it the brain or the therapy. There is no comma.
B is out

Bunuel
(C) for treating a variety of psychiatric disorders involving the passing of 800 milliamperes of electricity through the brain, is now administered sparingly, because of engendering
because of engendering is incorrect.
Also disorders are involving passing of current.
C is out

Bunuel
(D) to treat a variety of psychiatric disorders that involves the passing of 800 milliamperes of electricity through the brain, is now administered sparingly, because it engenders
"to treat" is a better tense than "for treating".
The word "that" rightly modifies the method, keeping the meaning in tact.
Electroconvulsive therapy, xyz, is now administered... - Correct
There is a comma before because. - Great
Hang on to D

Bunuel
(E) to treat a variety of psychiatric disorders involving the passing of 800 milliamperes of electricity through the brain, which is now administered sparingly, engenders
Again, disorders involve passing the current in option E.
Option E is out

D is the correct answer
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Answer: B

A, C, D and E are eliminated - amongst other issues, these options imply psychiatric disorder involves passing of electricity. Its the treatment that involves passing electricity.
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