Read the excerpt from act 4, scene 1 of The Tragedy of Macbeth. The witches are gathered around their cauldron, creating a potion.All. Double, double toil and trouble;Fire burn, and cauldron bubble.

The repeated words and rhythmic rhyme make the witches’ chant sound like a spell being spoken over the cauldron. “Bubble” especially suggests the sound of the potion bubbling, so the lines imitate noises associated with the potion. The best answer is D, “by imitating the noises made by the witches’ potion.”

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