Correct Answer: Two dozen cookies will be baked by my mother for the bake sale.

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 sentence becomes the subject in the passive voice.

The structure of the passive voice in the case of the simple future tense is: " Plural object + will be + past participle form of the main verb + 'by' followed by the agent of the action."

Therefore, the correct answer is: "Two dozen cookies will be baked by my mother for the bake sale."