The evidence which suggests that the dagger Macbeth sees is an illusion is:
"a false creation, proceeding from the heat-oppressed brain?"
Explanation:
In Act II Scene 1, the appearance of the dagger symbolizes the thoughts prevailing in the mind of Macbeth. He is struck between the feeling of guilt of killing the King and the temptation of becoming a King himself. He sees the image of the dagger hanging just next to him but he was unable to catch it by any trial.
Make an assumption from the details and descriptions the passage use to make out what the family is feeling. use details that maybe prove Andrew's thoughts feelings facial expressions.use the two answer you gave before to answer this question.