_____ me, I will be happy to dedicate a few extra hours to the cause.
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As to
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As of
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As for
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As from
C
Correct answer
Explanation
The correct phrase is 'as for' when introducing a new topic or transitioning to a different person in discussion. 'As' is functioning here as a preposition that must be followed by 'for' to indicate the person or topic being addressed. The other options ('as to', 'as of', 'as from') have different meanings and uses.