The correct answer to this option is A : Macbeth is asking Ross why he is being addressed as the Thane of Cawdor if the current Thane of Cawdor is still alive.
In the excerpt from Act 1, Scene 3, of The Tragedy of Macbeth; Macbeth is confused because he believes that the Thane of Cawdor is a prosperous gentleman and does not understand why he is being given this title. This dialogue reveals Macbeth's surprise and uncertainty about his newly bestowed title.
In this excerpt, Macbeth questions why he is being given the title of Thane of Cawdor when the current thane is still alive. The term "dress me in borrowed robes" is a metaphorical expression, suggesting that Macbeth feels undeserving or uncomfortable with the bestowed title since it rightfully belongs to the living Thane of Cawdor.