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Bunuel
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This is a good practice question and makes the test taker think hard about the last two choices C & D. The rest can be pretty much eliminated right off the bat.
(C) Not all of a person’s involuntary actions are actions of which that person is unaware.
(D) A person who hums involuntarily can easily learn to notice it and can thereby come to control it.

If we read critically we will notice that her being unaware of the humming is the premise to the conclusion that her humming was involuntary. Hence, we have to attack only her being involuntary(conclusion) and NOT her being unaware(premise).
This is the basic difference b/w C&D.
ANSWER D
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I eliminated answer choice C as this states "Not all". We do not know what not all can mean. Is it 75% of the involuntary actions? 25? How do we know that her specific involuntary action falls within the "Not All" category.
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I got answer by POE but I dont like answer D. The player stated that she cannot notice the humming. The official can say that a person who hums involuntarily can easily learn to notice it but it does not guarantee that it would work for her. I know you are supposed to choose the best not the absolute, but I dont like this kind of question to be honest.
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The official can say that a person who hums involuntarily can easily learn to notice it but it does not guarantee that it would work for her.
It seems that as per option D, learning to notice/control an involuntarily hum has 100% success rate. So, as per D, there is a guarantee that it would work for her (obviously as long as she is committed to learning this process).
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naul
The official can say that a person who hums involuntarily can easily learn to notice it but it does not guarantee that it would work for her.
It seems that as per option D, learning to notice/control an involuntarily hum has 100% success rate. So, as per D, there is a guarantee that it would work for her (obviously as long as she is committed to learning this process).

Notice my concession, before me complaining. I know the question says "if true" and we have to choose the best answer but again, I get it, if the answer is absolute, anybody will get it right. I am not arguing against the answer. I am just expressing my frustration. But your explanation helped me to remind again that I have to assume each option is true, so thank you for your post.
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She argued that since she was unaware of her humming, her humming was involuntary and that therefore she should not be held responsible for it.

(A) The officials of chess have little or no authority to control the behavior of its professional players outside of matches. - Irrelevant.
(B) Many of the customs of amateur chess matches are not observed by professional chess players. - Irrelevant.

(C) Not all of a person’s involuntary actions are actions of which that person is unaware. -

This means that there are some involuntary actions of which the person IS UNAWARE.
But IS "humming" one of those(some) involuntary actions where SHE IS UNAWARE ?

HEY MARIANNE, WE DONT KNOW IF THAT'S ONE OF THE THINGS YOU DO INVOLUNTARILY?
MAYBE, YOU DO. MAYBE, YOU DONT!
So,
IS THIS ENOUGH TO CONCLUDE WHETHER SHE IS RESPONSIBLE ? No it's not. It does not affect the claim.

(D) A person who hums involuntarily can easily learn to notice it and can thereby come to control it. - This choice directly knocks on the door of common sense. If she can hear or sombody else points it out for her that she is humming she can thereby LEARN TO STOP IT AND CONTROL IT THE NEXT TIME RATHER THAN ARGUING FOR IT.

(E) Not all of Marianne’s opponents are distracted by her humming during chess matches. - What about some opponents? They are distracted by her humming and that's the problem!
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Hey GMATNinja Can you please weigh in on this one? Thanks!
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