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

Could you share your car keys?

Could your car keys be shared by you?

The correct passive voice of the given sentence is Could your car keys be shared by you?

The active voice of the sentence is Could you share your car keys? This sentence is in the present tense, which is used to describe an action that is happening now or that is happening repeatedly. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "you" and the main verb is "share." The past participle of "share" is "shared." So, the passive form of the sentence is Could your car keys be shared by you?

The other options are incorrect because:

• Could your car keys be share by you? is missing the past participle of the verb "share."
• Can your car keys be shared by you? is in the present tense, while the original sentence is asking for permission.
• Could your car keys shared by you? is grammatically incorrect. The verb "share" must be in the past participle form, not the past tense form.
• Could your car keys be shared by you? is the passive voice of the original sentence, but it is not a complete sentence. It lacks a question mark.