Select the correct passive form of the given sentence.

Who keeps the accounts of this hotel?

By whom are the accounts of this hotel kept?

The correct passive form of the given sentence is By whom are the accounts of this hotel kept?

The active voice of the sentence is Who keeps the accounts of this hotel? This sentence is in the interrogative form, which asks a question. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the present participle of the main verb. In this case, the subject of the active sentence is "who" and the main verb is "keep." The present participle of "keep" is "keeping." So, the passive form of the sentence is By whom are the accounts of this hotel kept?

The other options are incorrect because:

• By whom have the accounts of this hotel been kept? is in the past perfect tense, while the original sentence is in the present tense.
• By whom are the accounts being kept of this hotel? is in the present progressive tense, while the original sentence implies that the keeping of the accounts is not an ongoing action.
• By whom the account is being kept of this hotel? is grammatically incorrect. The verb "is being kept" is followed by the singular pronoun "the," but the subject of the sentence is "accounts," which is plural.