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James Watt discovered the energy of steam.

  • A.The energy of steam discovered James Watt.
  • B.The energy of steam was discovered by James Watt.
  • C.James Watt was discovered by the energy of steam.
  • D.James Watt had discovered energy by the steam.

Answer: B

Correct answer: The energy of steam was discovered by James Watt.

The object becomes the subject and the subject becomes the agent after by. The option reversing them makes the energy of steam the discoverer, and the first option has no passive verb at all.

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