The correct answer is B. The arm of the injured man was bandaged by the doctor.
Option A is incorrect because the doctor did not injure the man. The man was already injured.
Option C is incorrect because the injured man did not bandage his own arm. The doctor bandaged it.
Option D is incorrect because the injured man did not make the doctor injure his arm. The man was already injured.
The doctor bandaged the arm of the injured man. This means that the doctor applied a bandage to the man’s arm in order to protect it and help it heal. The man was injured, and the doctor’s job was to help him recover. Bandaging the man’s arm was one way that the doctor could do this.