Rachael Was Arrested by the Police on Suspicion of Possession

Rachael was arrested by the police on suspicion of possession of a controlled substance.She was informed of her Miranda rights.Rachael waived her right to remain silent and confessed to the crime after a brief period of police interrogation.Her confession is:

A) admissible,according to Supreme Court precedent.
B) inadmissible because it was obtained in violation of her Fourth Amendment rights.
C) admissible,according to the "search incident to a lawful arrest" exception to Miranda.
D) inadmissible because it was obtained in violation of her Fifth Amendment rights.