Bob Is a Suspect in a Sexual Assault

Bob is a suspect in a sexual assault. He is read his rights, and the detectives start to question him. Bob asks for a lawyer, but the detectives press on, continuing to ask Bob questions. Eventually he confesses. His lawyer makes a motion to suppress the confession because she maintains that the confession was taken in violation of Bob's right to counsel. Which Amendment forbids the use of this confession?

A) The Fifth Amendment
B) The Sixth Amendment
C) The Fourteenth Amendment
D) The Sixteenth Amendment