Correct Answer: How many glasses of water are drunk by you daily?

Solution : The correct choice is the third option.

Passive voice is the voice in which the object experiences an action rather than the person who performs the action. Hence, the object in the active voice becomes the subject in the passive voice.

The structure of the passive voice in interrogative form is: " How + object + are + past participle form of the main verb + by the agent of the action + rest of the sentence?"

Therefore, the passive form would be: How many glasses of water are drunk by you daily?