Which sentence in the passage is an example of an oxymoron?

The sentence which has "deafening silence."

Explanation:

"deafening silence," which describes a silence that is so overpowering it almost feels deafening, or extremely loud—just as an actual sound would.

recent news about two years ago indicates that a polish forestry student by chance unearthed at a depth of about 40cm (16 inches), during digging in a damp polish forest he found a 13-page manuscript into a thermos flask.

greek jew marcel nadjari was a aischwitz slave who witnessed how the nazi's built big death chambers and crematoriums and told how he was forced to escort fellow jews to the gas chambers. he accounts on this manuscript how the nazi's disguised this chambers to look like showers. also, he describes this place as a process of extermination from the chambers to the trains arriving to take the bodies.

and your question what topic are you in trouble with?