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Question 158·Hard·Words in Context

Education officials may assume that earmarking a grant for textbooks ensures that a district's textbook spending will rise by the full amount of the grant. But if the district had already planned to make the same purchases with local revenue, it can substitute the grant and redirect that revenue to noneducation uses; neither textbook purchases nor total education spending must increase. Thus, despite its formal designation, the grant may be _____ in practice.

Which choice completes the text with the most logical and precise word or phrase?