The one hurt MOST by unanticipated inflation is "retirees who are living on fixed incomes."
This is because inflation is a condition where the price of goods is high, making people spend more on the same amount of goods they buy for less before.
In this case, a retiree with a fixed income would spend more when there is unanticipated inflation, and this period would hurt him more as he earns a fixed income.
Hence, in this case, it is concluded that the correct answer is option A. "retirees who are living on fixed incomes."
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