Ignorance can be much more than a metaphor <em>indicating </em>darkness of the mind--it <em>can</em> be the darkness of the mind. One who is ignorant refuses to believe, accept the truth, or understand their actions. Shakespeare's words can be a universal truth since ignorance is not fiction--it is something that makes up a lot of today's society.
Note: I didn't read Shakespeare, so if there are things you feel need to be included, go ahead and add it. :)
Answer: without that much context, it would be pretty hard to answer this question. But I would guess (A)
Eliminate passive voice by making the subject do the action. You can shift the focus of the sentence from the direct or indirect object to the actor. For example, you can transform the following sentence from passive to active voice. Passive: The tree was cut down by the man.