After Macbeth learns he has been named Thane of Cawdor he says in an aside: If good, why do I yield to that suggestion
Whose horrid image doth unfix my hair
And make my seated heart knock at my ribs,
Against the use of nature? Present fears
Are less than horrible imaginings:
My thought, whose murder yet is but fantastical,
Shakes so my single state of man that function
Is smother'd in surmise, and nothing is
But what is not.

What realization about becoming King does Macbeth experience in these lines?

a The weird sisters are actually going to crown him King.
b In order to become King, he must commit murder.
c His wife is crowned Queen, making him King.
d Becoming King is just a fantasy, it will not really happen.