Lady macbeth. a soldier and afeard? what need we fear
who knows it, when none can call our pow'r to
accompt? yet who would have thought the old man
to have so much blood in him?
what does lady macbeth mean by "when none can call our pow'r to accompt" in these lines from act v of the tragedy of macbeth by william shakespeare?

a) she is expressing a fear of macduff that the king shares.
b) she and macbeth cannot explain why they have so much power.
c) she believes that she and the king are all-powerful.
d) she and macbeth are calling for an increase in power.