Which of the Following Is an Example of Implied Consent?​

Which of the following is an example of implied consent?​

A) ​Patient signs a consent form for surgery after discussing the procedure with her physician.
B) ​Patient makes an appointment and arrives at imaging center for an x-ray.
C) ​Patient fills out advance directive documents with instructions if she becomes unable to make decisions.
D) ​Patient does not want treatment, but it is given because the physician believes the patient needs it.