In Miranda V

In Miranda v. Arizona, Miranda's voluntary confession was thrown out because:

A) Miranda asked for an attorney but was questioned before the attorney arrived.
B) Miranda spoke such poor English that he didn't fully understand his rights as told to him and an interpreter was not provided.
C) Miranda spoke English but didn't read English, so he didn't 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 didn't know his rights, and even though he was not forced to talk by the police, his confession was therefore not truly voluntary.