Someone has lit the fire.

The fire was lit by someone.
You are requested to light the fire by someone.
The fire has been lit by someone.
The fire had been lit by someone.

The correct answer is: C. The fire has been lit by someone.

The other options are incorrect because:

  • A. The fire was lit by someone is in the past tense, but the question is about the present.
  • B. You are requested to light the fire by someone is in the passive voice, but the question is about the active voice.
  • D. The fire had been lit by someone is in the past perfect tense, but the question is about the present.

The sentence “Someone has lit the fire” can be paraphrased as “The fire has been lit by someone.” This means that someone has done the action of lighting the fire. The action is in the present tense, because the sentence is about the present. The sentence is in the active voice, because the subject of the sentence (“someone”) is doing the action.