In Which of the Below Situation Was the Defendant's Miranda

In which of the below situation was the defendant's Miranda rights violated because he or she was not given the Miranda warnings?

A) Defendant in confinement was questioned by an uncover agent who was pretending to be his buddy.
B) Defendant was questioned in her bedroom after she was taken into custody.
C) Defendant was questioned at a police station after he voluntarily appeared at the station.
D) Defendant driver was handcuffed and asked only his name and ordered to produce his driver's license.