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Beer and wine are both preserved to a degree by

  • A.The heat applied throughout their fermentation
  • B.The absence of any residual sugar in either drink
  • C.Their alcohol content and low pH
  • D.The high salt concentration each of them carries

Answer: C

Ethanol and acidity together exclude most organisms, which is why the spoilage flora of each is narrow and specialised. Neither drink is salty, neither is heated during fermentation, and many examples of both retain some sugar.

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