Correct Answer: Let your business be managed by your son after your retirement.

Solution : The third option is correct.

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 imperative sentence in passive form is: " Let + object + be + past participle form of the main verb + by + agent of action + prepositional phrase."

Thus, the correct sentence is: Let your business be managed by your son after your retirement .