Final answer:
Lady Macbeth advises Macbeth to appear harmless while ready to attack, best described by Option 2: Feign innocence and strike swiftly, representing a strategy of deceptive appearance and swift action.
Step-by-step explanation:
Lady Macbeth's advice to Macbeth to "look like the innocent flower, But be the serpent under't" suggests a strategy of deception - appearing harmless while being dangerous. This advice is best captured by Option 2: Feign innocence and strike swiftly, which encapsulates the act of pretending to be harmless (the innocent flower) while being ready to attack at the opportune moment (the serpent underneath), much like a serpent that lies in wait before striking quickly. In Macbeth, Lady Macbeth frequently counsels her husband on how to mask his true intentions and present a facade of innocence to achieve their ambitions. Her recommendations align with the tactics of deception and swiftness outlined throughout the play. Thus, Lady Macbeth's tactics reflect a combination of psychological manipulation, strategic planning, and the ruthless execution of their plans.