Change into passive voice: “She will have visited her doctor by 7:00 PM.”

Correct answer: Her doctor will have been visited by her by 7:00 PM. The future perfect passive is “will have been + past participle”, and the time phrase must be kept.

• Her doctor had been visited by her by 7:00 PM: “Had been visited” changes the tense to past perfect.
• Her doctor will have been visited by her: This option drops the time phrase “by 7:00 PM”.
• None of these: “None of these” is incorrect because the first option is correct.