Explanation:

- Option 1: The arm of the injured man was bandaged by the doctor.

- This sentence correctly transforms the active voice into the passive voice.

- The action focuses on the object (the arm) rather than the subject (the doctor).

- This is the correct answer.

- Option 2: The injured man bandaged his arm.

- This sentence changes the meaning entirely.

- It implies the injured man bandaged himself, which isn’t true to the original sentence.

- Option 3: The injured man made the doctor injure his arm.

- This sentence changes the action from bandaging to injuring.

- It does not retain the original meaning.

- Option 4: The doctor injured and bandaged the arm of a man.

- This adds an action (injured) not present in the original sentence.

- It alters the meaning of the original sentence.