Question

The entire thrust of police interrogation . . . was to put the defendant in such an emotional state as to impair his capacity for rational judgment. . . [T]he choice on his part to speak to the police -- was not made knowingly

What does this quotation say about how Miranda’s confession was made?

Miranda incriminated himself without knowing that he could refuse.
Miranda was completely aware of his rights when he made his confession.
Miranda was unaware of his rights, but his confession could be used.
Miranda incriminated himself intentionally and knowingly.

Answer 1

"Miranda incriminated himself without knowing that he could refuse."

Explanation: the quote says the interrogation was designed to impair his rational judgment and that his decision to speak was "not made knowingly," meaning he didn't understand or knowingly waive his right to remain silent.