The sentence that is the most subjective summary of a story is: her reactions to others suggest that the protagonist is a strong and self-assured young woman. When we say subjective, it is based on personal feelings, thoughts or opinions rather than based on the actual facts given in the story.
The title of a piece of writing is always written in italics, and often underlined.
The tone of the letter was too informal and lacks details needed for good resolution. This is the answer because the paragraph was opinionated, and DID NOT state specifics.