Select the option that expresses the given sentence in passive voice.

Have you submitted the papers at the post office?

Have the papers been submitted by you at the post office?

The correct passive form of the given sentence "Have you submitted the papers at the post office?" is Have the papers been submitted by you at the post office?

The other options are incorrect because:

• Have the papers been submit by you at the post office? uses the past participle form of the verb "submit" without the auxiliary verb "have."
• Had the papers submitted by you to the post office? uses the past perfect tense, which is not typically used for questions.
• Has the papers been submitted by you at the post office? uses the singular form of the auxiliary verb "have" for a plural subject, which is grammatically incorrect.