In Miranda V.Arizona,Miranda's Voluntary Confession Was Suppressed Because

In Miranda v.Arizona,Miranda's voluntary confession was suppressed because

A) Miranda asked for an attorney but was questioned before the attorney arrived.
B) Miranda spoke such poor English that he did not fully understand his rights as told to him and an interpreter was not provided.
C) Miranda spoke English but did not read English, so he did not understand that the document he signed was a confession.
D) Miranda was questioned in a police interrogation room and the Court deemed the setting too coercive, particularly since he did not know his rights, and even though he was not forced to talk by the police, his confession was therefore not truly voluntary.