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Tough one!

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Tough one!

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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

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GmatKiss wrote:
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
from X to Y ...rules out D,E
X and Y need to be parallel
X is "duty assignments in nuclear submarines and air-traffic control towers"
so Y can not be people or staff...so that rules out A,B
IMO C
please give OA.

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I think C should be the ans

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Idiom use - from x to y
From duty assignments to the staffing of... Both are noun phrases

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