In the Tempest, the thing that Prospero does not worry about in Act IV is:" The plot of Caliban, Trinculo, and Stephano killing him" (Option D)
Who is Prospero?
The Tempest's primary character is Prospero. He is the Du.ke of Milan, who was deposed by his brother Antonio fifteen years before the play begins and is now stranded on a boat with his young daughter, Miranda.
During those fifteen years, he researched and self-taught himself magic.
In retaliation to Caliban's moves, Prospero curses him, referring to him as "a born devil, on whose nature nurture can never stick".
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