What Is the Essential Reason Why the Right to Counsel

What is the essential reason why the right to counsel under the Fifth Amendment is less restrictive on the role of the police than the right to counsel under the Sixth Amendment?

A) The right to counsel under the Fifth Amendment can be waived, but the right cannot be waived under the Sixth Amendment.
B) The Sixth Amendment is part of the Bill of Rights; the Fifth Amendment is not.
C) The Sixth Amendment concerns rights after criminal charges have been formally filed.
D) The "due process" provisions of the Fifth Amendment are less enforceable in court than the provisions of the Sixth Amendment.