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For deltaH and deltaG to be very similar, the change in entropy has to be minimal, so you would look to see which reaction has the least change in entropy, which would be A since the phase remains a solid throughout the reaction.
In order to solve this problem, you need to see which choice gives you an answer that has the smallest delta S. A would be the answer because that is the only one in which the state stays solid throughout, and solids have the lowest entropy values.
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