45. At which place in the article would the following sentence best be inserted? "They are given more space to move around and access to the outdoors, which help to keep them healtiry."
(A) The place marked by W
(B) The place marked by X
(C) The place marked by Y
(D) The place marked by Z

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統計： A(3), B(36), C(7), D(25), E(0) #2450850