13.
The answer is: D
Explanation
The correct option is D: We had completed our task before sunset.
The sentence "Our task had been completed before sunset" is in the passive voice. To convert it to the active voice, we need to identify the subject performing the action and make it the focus of the sentence. In this case, the subject is "we," and the verb phrase is "had completed."
The active voice sentence is "We had completed our task before sunset." This transformation retains the original meaning while shifting the focus to the subject performing the action.