Answer:
I believe its B it makes the most sense
Bilbo in meeting Gollum in <em>The Hobbit</em>, came in contact with the One Ring, a ring that grants the wearer power of invisibility, and is one of the most powerful rings inside the world of the L.O.T.R.
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literal: I know fire
Deeper meaning: this person knows what it's like to be filled with hate and anger, this represents the fire he feels.
