What role do the letters between father and son play in “When the Emperor was Divine”

For most of the novel, the father only exists in the memories of the other family members and in the short, censored letters he writes from the detention camp (he was detained by the U.S. government months before the story begins). The family remembers him as a loving, mild-mannered, and gentle man, and his warm letters, though censored, confirm that he loves and cares for his family. However, when we see the man at the end of the novel, he is a bitter and weary, reeling from the psychological effects of being unjustly interned as an “alien enemy.” Gripped by his rage and resentment at America for imprisoning him and his family, the man slowly disconnects from the family, becoming more sullen and withdrawing into his inner world. Though he did not physically die at the camp, he does return as a ghost of his former self.

Explanation:

i think its a bad thing why? one word flood

i know 2 is c.

i'm leaning towards a for 1.