'Who can do it ?' বাক্যটির Passive form হবে? ?

To convert the active voice question "Who can do it?" into the passive voice, we must follow specific grammatical rules. The structure we are aiming for involves the verb "do" being transitioned to its passive form, which is "done." In this case, the tense and modality must also be preserved.

1. Identifying the Components: In the active sentence, "who" acts as the subject (the doer), while "it" is the object (the action being performed on).

2. Changing to Passive Voice: In the passive voice, the focus shifts to the action and the object rather than the subject. The standard construction for passive sentences uses "be" + past participle. Here, "it" becomes the subject of the passive question, so our new structure starts with "it."

3. Maintaining the Modal: The original question uses the modal verb "can," which must remain as is when converting to passive voice. The proper construction for the passive form with "can" is "can be."

4. Choosing the Correct Form: Thus, we say, "By whom can it be done?" This correctly adheres to grammatical rules and maintains the meaning of the original question. The other options either misuse the verb forms or the auxiliary verbs, making them incorrect.

In summary, option D is correct because it accurately reflects the transformation from active to passive voice while preserving the original meaning and grammatical integrity.