When someone knows that he has been defeated, there is a sign of disappointment. The quotation that best shows that Gollum knows he has been defeated is;
In this quote above, Gollum is disappointed to learn that his birthday present was his defeat in the battle.
He curses and desires to know how this defeat was possible. This statement reveals his displeasure and disappointment.
Therefore, quotation 3 reflects the fact that Gollum realizes that he knows that he has been defeated.
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