Question

What evidence leads you to believe that the dagger Macbeth sees is an illusion?

A."Come, let me clutch thee."
B."The handle toward my hand?"
C."I have thee not, and yet I see thee still."
D."Is this a dagger which I see before me"

Answer 1

C.) I have thee not, and yet I see thee still.

Answer 2

The evidence that leads you to believe that the dagger Macbeth sees is an illusion is  "Or out thou but/ a dagger in my mind." So, from the choices here, I do believe the correct answer is D.