Respuesta :
I'd say the answer is 'the visible is more dangerous than the invisible', because Duncan never suspected that his faithful Macbeth would be the one to kill him.
The correct answer is A. those without convictions are easily manipulated.
In the tragedy, Macbeth is easily manipulated by both his wife and the witches. Lady Macbeth urges him to kill his king so that he can become the next king, according to the witches' prophecy that he will inherit the throne.
B is incorrect because the invisible is more dangerous than the visible, not the other way round. C is incorrect because Macbeth never had any firm beliefs. D is incorrect because Macbeth has no friends.