I believe that it is that she believes that she and the king are all-powerful. She’s explaining why there is nothing to fear and she marvels at the old man and how much blood he can shed.
Answer: C) She believes that she and the king are all-powerful.
Explanation: In the given passage from "Macbeth" by William Shakespeare we can see Lady Macbeth speaking about how she and Macbeth killed the king Duncan. She feels guilty, but she thinks that there is nothing to fear because she and Macbeth have a lot of power, and that this power will protect the, we can see this in the phrase: "What need we fear who knows it, when none can call our pow’r to accompt?"
