how are we supposed to know? you don't give us any information.
It creates a reassuring tone should be the correct answer.
Some people might say it is even good to mention incomplete projects, It's even better to have something already done. I would say that it would be fine to mention it, might even help.
Answer:
Macbeth made the mistakes. First, he tries to back down when he has second thoughts. Second, He forgets to plant the knives on the guards. Lady Macbeth steps in to fix the mistakes. She gets Macbeth to go through with the murder and plants the bloody knives on the guards after Macbeth refuses to re-enter Duncan's room.
Explanation: