Which theme is supported by Lady Macbeth’s lines?

Wherever in your sightless substances
You wait on nature's mischief! Come, thick night,
And pall thee in the dunnest smoke of hell
That my keen knife see not the wound it makes

A. Darkness is dangerous.
B. Ambition unchecked can lead to corruption.
C. Things are not always what they seem.
D. Those without convictions are easily manipulated. Answer is A.