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A renewable feedstock is preferred to a petrochemical one because it is

  • A.identical in composition to the petrochemical
  • B.replenished on a human timescale
  • C.always cheaper per unit mass
  • D.free of any impurities

Answer: B

Correct answer: replenished on a human timescale

A renewable feedstock is one that regrows within a period comparable with its use, so it is not depleted by being consumed. Nothing else follows automatically: a renewable feedstock is not necessarily cheaper, purer, or of the same composition as its petrochemical counterpart, and its cultivation carries its own impacts.

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