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.

The quote says the interrogation impaired Miranda’s ability to make a rational choice, so his decision to speak was not knowing. This supports choice D: Miranda incriminated himself without knowing that he could refuse to do so. Choices A and B contradict the quote’s statement that his choice was not made knowingly.

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