In this English grammar question on voice, a sentence in the active voice is given in the present perfect tense. Out of the four alternatives, select the option that best expresses the same idea in the passive voice: Have you finished the task?

Introduction / Context:
This question asks you to change a present perfect active interrogative sentence into passive voice. The original sentence "Have you finished the task?" asks whether the person addressed has completed some piece of work. In the passive version, "the task" becomes the subject, and the question still checks whether it is complete. The correct option must maintain the present perfect tense, the question form, and the meaning of completion.

Given Data / Assumptions:

• The tense is present perfect, indicated by "Have you finished".
• The subject is "you".
• The object is "the task".
• The sentence is a question, so the auxiliary appears before the subject.
• The passive form must still ask whether the task is complete and mention "you" as the person who might have finished it.

Concept / Approach:
To form the passive voice of a present perfect sentence, we use the structure "has / have been + past participle". The object "the task" becomes the subject in the passive sentence. Because "task" is singular, we use "has been finished". For a question, the auxiliary "Has" must be placed at the beginning of the sentence. The agent can be added at the end using "by you". This keeps the tense, aspect, and interrogative form consistent with the original active sentence.

Step-by-Step Solution:
First, identify "the task" as the object that will serve as the subject in the passive sentence. Second, note that the tense is present perfect, so the correct passive auxiliary for "the task" is "has been". Third, form the passive verb phrase "has been finished" using the past participle of "finish". Fourth, add the agent phrase "by you" at the end of the sentence to indicate who may have finished the task. Fifth, place the auxiliary "Has" at the beginning to preserve the interrogative structure: "Has the task been finished by you?".

Verification / Alternative check:
The question "Has the task been finished by you?" clearly asks whether the task now stands in a completed state due to your action. The present perfect passive "has been finished" corresponds directly to "have finished" in the active voice. The agent phrase "by you" maintains the sense that the listener is responsible for the work. When you compare both sentences, the only change is the grammatical reordering from active to passive, while the tense, aspect, and meaning are fully preserved.

Why Other Options Are Wrong:
Option A uses an unnatural nominal expression "Has finishing of the task been done", which sounds awkward and does not reflect the clean passive form the question is testing. Option C has an incorrect auxiliary agreement "Have the task been", which is grammatically wrong for a singular subject. Option D shifts the tense to past perfect "Had the task been finished", which changes the time reference and no longer matches the original sentence. Only option B uses the correct structure "Has the task been finished by you?" in present perfect passive interrogative form.

Common Pitfalls:
A frequent error is to forget that in passive questions, the auxiliary must agree with the new subject, not with the original subject. Another mistake is to confuse present perfect with past perfect, replacing "has / have" with "had". Some learners also create wordy constructions with "finishing of the task", which are not needed and often sound unnatural. To avoid these issues, first convert the statement "You have finished the task" into passive "The task has been finished by you", then simply move "Has" to the front to form the question.

Final Answer:
The option that correctly expresses the sentence in the passive voice is: Has the task been finished by you?