“Call the witness”, said the magistrate.

The correct answer is C. The magistrate ordered to call the witness.

A request is a polite or formal asking for something. A beg is a humble or earnest request. An order is a command or instruction to do something. A prayer is a solemn request or entreaty addressed to God or a god.

In the given sentence, the magistrate is using a formal tone and is in a position of authority. Therefore, it is most likely that the magistrate is ordering the witness to be called.