Which is the following is an example of an oxymoron

One oxymoron example is "deafening silence," which describes a silence that is so overpowering it almost feels deafening, or extremely loud—just as an actual sound would. Oxymorons are often used in everyday conversation and in a breadth of writing, such as literature, poetry, and songwriting.

Explanation:

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the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.