The “helping words” are missing so I believe this line is a Metaphor.
Segregation was described as wilderness as a way of indicating the inhumaneness of this treatment, for literally wilderness indicates a place without civilization or society.
Injustice is not always a wilderness, although it sometimes can be. Injustice acts within established society all the time -- sometimes, de jury, it can be under the guise of a law-abiding action, but in reality (de facto) it could be injustice. For example, Donald's Trump urge to deport and restrict immigrants from certain countries reflects injustice in an established environment (in my opinion, of course).
After thorough researching, the revision added dramatic irony because of the reason it strengthens the emotions and the meaning of the text that was stated. It helped the reader absorbed the text and improve their comprehensive skills at the same time.
My father visited John Grisham, author of the novel a time to kill, in Oxford, Mississippi.
I think the answer is C/ the third option
