In Act II, scene III Donalbain states, in conversation with his brother Malcom: "There's daggers in men's smiles." His words are an example of:

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3 points
soliloquy
metaphor
foreshadowing
Both soliloquy and foreshadwoing
Both metaphor and foreshadowing

The correct answer is metaphor. Donalbain is using a metaphor to convey the idea that people's smiles can be deceptive and hide malicious intentions.