The thing which Gertrude tells Claudius in Act 4, Scene 1, after Hamlet has killed Polonius is:
According to the given question, we can see that we need to find out the reaction which Gertrude has after Hamlet kills Polonius and what she told Claudius, Hamlet's uncle.
As a result of this, after Hamlet had killed Polonius, Gertrude told Claudius in Act 4, Scene 1 that Hamlet was truly mad. It was widely suspected in the court that Hamlet was mad after his encounter with the witches and finding out it was his uncle Claudius that murdered his father.
Therefore, the correct answer is option C
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