Read the following excerpt from Act V before answering the question that follows:
MACBETH: "... Let them fly all.
Till Birnam Wood remove to Dunsinane.
I cannot taint with fear. What's the boy Malcolm?
Was he not born of woman? The spirits that know
All mortal consequences have pronounced me thus:
'Fear not, Macbeth. No man that's born of woman
Shall e'er have power upon thee..."

What argument does Macbeth make to reassure himself that Malcolm and Macduff are not a threat
to him?

They are both far away in England.
They do not have the military power that he has.
They have both been born of a woman.
They have fled Scotland out of fear

In the text, Macbeth writes "Was he not born of woman? The spirits that know All mortal consequences have pronounced me thus: 'Fear not, Macbeth. No man that's born of woman Shall e'er have power upon thee..." This is exemplifying how Macbeth is trying to convince himself that they aren't to be feared. Also, A, B, and D can't be the answer because neither makes any sense. Hope this helped :)