Answer: C) She believes that she and the king are all-powerful.
Step-by-step 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?"