Answer: The added stage direction in the excerpt from Act 5, Scene 8 of The Tragedy of Macbeth contributes to a triumphant mood. The stage direction describes Macduff entering with Macbeth's head in one hand and Macbeth's crown and sword in the other, which suggests that he has successfully defeated the usurper and restored the rightful king to the throne. The declaration of "Hail, King of Scotland!" by both Macduff and the crowd reinforces this triumphant mood and indicates that the people of Scotland are happy to have Malcolm as their new king. Therefore, option A, a triumphant mood, is the correct answer.
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