When I am alone, I hear the footsteps of my friend in my imagination.

  • A. The footsteps of my friend heard by me, when I am alone.
  • B. The footsteps of my friend is heard by me when I am alone.
  • C. The footsteps of my friend are heard by me when I am alone.
  • D. The footsteps of my friend was heard by me when I am alone.

Explanation

“Footsteps” is plural, so the passive verb must be “are heard.” The singular forms “is” and “was” disagree with the plural subject, while option a lacks the auxiliary verb.

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