Which constitutional principle is applied when police inform suspects of their rights?.

Constitution's Fifth Amendment

Explanation:

It gives the suspect the right to refuse "to be a witness against himself". Also "In criminal cases, the Fifth Amendment guarantees the right to a grand jury, forbids “double jeopardy,” and protects against self-incrimination."

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which sentences ? that question is incomplete

answer; (d) they are in charge of the ushers and making sure the audience gets to their seats on time; they also control the box office; i know (c) is wrong and (b) don't make sense;