Answer:
The audience learns from the lines "Be innocent of the knowledge,
dearest chuck, / Till thou applaud the deed" that
Option A: Macbeth will keep Banquo's murder a secret until after the murder has been committed.
Explanation:
In the story "Macbeth" by Shakespeare, Lady Macbeth convinced his husband to murder Duncan. Later she also planned to kill Banquo who is Macbeth's best friend.
Though Macbeth is a noble person, but he wants to become the king and has a thirst for power. He decided that he will only reveal about Banquo's murder to his wife only when the action is completed.
Macbeth is sure that once she comes to know about the murder, she would be very happy and will applaud him for this.