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OG SC#

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extroversion
 Post subject: OG SC#
 Post Posted: Fri Feb 19, 2010 3:30 am 
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Studies of the human "sleep-wake cycle" have practical relevance for matters ranging from duty assignments in nuclear submarines and air-traffic control towers to the staff of shifts in 24-hour factories.

(A) to the staff of
(B) to those who staff
(C) to the staffing of
(D) and staffing
(E) and the staff of

why the best answer is C ?
I agree that C sounds best. But why is staff in answer choice A also not parallel? Is it because assignments and staffing are action nouns whereas staff is not?
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mrsmarthi
 Post subject: Re: OG SC#
 Post Posted: Fri Feb 19, 2010 9:55 pm 
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I think this sentence is testing the idiom - range from X to Y.

X = duty assignments (noun)
Y should also be parallel to the work related nouns. And that is clear in C - The staffing of shifts.
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extroversion
 Post subject: Re: OG SC#
 Post Posted: Sat Feb 20, 2010 9:37 am 
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Thanks a lot =)
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