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

Kiara will sign all the documents tomorrow.

All the documents will be signed by Kiara tomorrow.

The correct option that expresses the given sentence in passive voice is All the documents will be signed by Kiara tomorrow.

The other options are incorrect because:

• Kiara was to be signed by tomorrow for all the documents is grammatically incorrect. The subject of the sentence is "Kiara," but the verb "signed" is in the passive voice, which means that the subject is being acted upon.
• Tomorrow Kiara will be signed by all the documents is grammatically incorrect. The subject of the sentence is "Tomorrow," which is not a person or thing that can perform an action.
• Kiara would have been signed tomorrow by all the documents uses the past perfect tense, while the original sentence is in the future tense.