The right answer is "fuels the external conflict.
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Explanation: The text clearly does not create a mood or develop a character. Nor does it create an internal conflict because an inner conflict is one that has a kind of inner quarrel that the characters interlock between their innermost reasons and emotions and trigger bad feelings.
Thus, the text feeds external conflict. An external conflict occurs when a character must overcome a challenge with another character, the forces of nature, technology or society. In this case the external conflict is presented when the Indians were removed from their lands, against their will, by the non-indigenous society, showing of this conflict a challenge between characters and society.
It allows him to move further on and figure out why things happened the way they did. And allows him to heal because it takes the stress and gets him out of the rut, that is caused by not forgiving himself.