Final answer:
In Shakespeare's Macbeth, the quote mentioned is spoken by Macbeth to Lady Macbeth in Act 3, Scene 2, where he intimates that she should remain ignorant of his plans.
Step-by-step explanation:
The quote “Be innocent of the knowledge, dearest chuck” is said by Macbeth to Lady Macbeth in Act 3, Scene 2 of Shakespeare's play, Macbeth. In this scene, Macbeth is preparing for the murder of Banquo and keeping it hidden from his wife, suggesting that he wants her to remain innocent of the crime's details. This demonstrates a change in their relationship, where Macbeth is now taking charge and not involving Lady Macbeth in his plans, contrary to the initial murder of Duncan where she was the mastermind behind the plan. The correct answer to the question is option a) Lady Macbeth.