The answer is truly Washington's farewell address. B.
"His farewell address was published in the Philadelphia newspaper where he encouraged the next political leaders not to form political parties and the dangers of forming political parties, but also to avoid permanent alliances with nations. This influenced American leaders of forming alliances for more than 100 years"- MS US History guided notes :)
Because the author can show how characters change (A), but they need to show how the characters acted before the change (C). And B is just what explains the character.
