B or D because they seem really reasonable
It's subordinate. Meaning that it is dependent on the main clause.
<span>Yellowstone National Park, the West's oldest national park, is the site of Old Faithful.
All proper nouns are capitalized in this sentence correctly.</span>
Since the flames of the gas chambers and the flames of the battle extinguished his true belief in god, he is saying that he will never forget. He will never forget the pain and suffering and his lost loved ones and all the pain he survived through.