I think this question asks if the arguments Lady Macbeth uses are based more on pathos or on logos. I agree completely with Janeyb--Lady M is a master of the emotional argument. Think of her response to Macbeth when, after much consideration, he tells her he's decided not to kill Duncan. She responds by asking him if the hope was drunk that he had earlier dressed himself in and suggests that if he could change that much in his ambition, so changeable and weak must be his love for her. Then she calls him a coward, and she attacks his masculinity, saying he would would be a man--more than a man, even, when he dares to do the deed. Then she says she would gladly have plucked her smiling baby from her nipple and bash its brains out before she would break a promise to him. There's not a whit of logic in this argument--it's aimed straight at the heart. Or something.
Arguments based on pathos are those that appeals to the audiences emotions, those based on logos uses logical appeal, usually applying data. Therefore, the arguments in "Lady Macbeth" are clearly based on Pathos. The characters, especially Macbeth himself, almost entirely on passion. Macbeth's killing of Duncan's servants in the beginning of the play show this. One of the most famous lines in the play So foul and fair a day I have not seen." (1.3.38)is so contradictory that immediatly you know that it cannot be based on logos
Pathos- dealing with a lot of emotions, including pity, sorrow etc.
Logos- using logical appeal and analytical thinking skills. Used mostly during debates and when you are writing a persuasive essay in your exam.
I think the story itself is more about pathos than logos as these characters are very emotional substance, always quick to the feet to blurt out something which makes no utter sense or any logic, which contradicts to logos, which is stated above