Final answer:
In the play 'Hamlet' by William Shakespeare, the King sends a letter with Rosencrantz and Guildenstern to England asking for Hamlet to be imprisoned in the Tower of London until he regains his sanity.
Step-by-step explanation:
The content of the letters the King sends with Rosencrantz and Guildenstern to England with Hamlet is option c: The King sends a document saying that Hamlet is mad and asking that he be imprisoned in the Tower of London until he regains his sanity.
This is evident in the play 'Hamlet' written by William Shakespeare. The King, in his attempt to deal with Hamlet's perceived madness, decides to send him to England with Rosencrantz and Guildenstern. The letter is meant to convince the King of England to imprison Hamlet until he is sane again.
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