Choose the correct relative adverb to fill in the blank: "The investigation panel demanded to know the exact reason _______ the automated system had failed to deploy the backup power."

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A where
B when
C why
D which

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Answer: C. why

Answer: (C) why
Explanation: "Why" is a relative adverb used specifically to introduce an adjectival clause that states a cause or reason, directly corresponding to the preceding noun "the exact reason".

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Choose the correct relative adverb to fill in the blank: "The investigation panel demanded to know the exact reason _______ the automated system had failed to deploy the backup power."

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