From the words or group of words lettered A to D, choose the one that best completes the sentence. If I ... what actually happened, I would have punished hi...

From the words or group of words lettered A to D, choose the one that best completes the sentence.
If I ... what actually happened, I would have punished him.

Answer Details

The correct answer is "had heard." This is because the sentence is in the past perfect tense, which indicates that the action happened in the past before another past action. In this case, the speaker did not hear what happened in the past, and as a result, did not punish the person who did something wrong.