An Officer Is Conducting an Investigation and Has Become Particularly

An officer is conducting an investigation and has become particularly suspicious of a certain person to the point of concentrating all the investigative methods and inquiries on proving that that suspect is the perpetrator. The officer is about to question the suspect (who does not realize she is suspected of the crime) in the suspect's home. For any statements to be admissible, _____.

A) the officer must give Miranda warnings because custody exists when he starts the questioning
B) the officer must give Miranda warnings because the suspect is the focus of the investigation
C) the officer must give Miranda warnings if he informs the person she is a suspect
D) the officer need not give Miranda warnings even if he informs the person she is a suspect, so long as the officer does not create a coercive atmosphere