Correct Answer: The bicycle will be repaired by the mechanic on Sunday.

Solution : The second option is the correct answer.

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 the case of the simple future tense is: "Singular object + will be + past participle of the main verb + 'by' followed by the agent of the action + time phrase."

Therefore, the correct answer is: The bicycle will be repaired by the mechanic on Sunday.