C or the third choice.
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C, The dim light coming through the windows lit up the larger objects, but my eye could not see anything in the corners of the room.
Answer: A combination of them all
Explanation: At the end of the day, the final decision and fault fall on Macbeth for dealing the blow and going through with it. Although, the pressure of these witches and Lady Macbeth would ultimately be the push of him killing.