Sally is antecedent for herself
letter is an antecedent it
the antecedent is what the pronoun modify
Chapter 13 of The Lighting Thief is about Percy Jackson, Annabeth and Grover finally reaching their destination: St. Louis. Once they reach the Arch, at St.Louis, they encounter a monster/Chimera. Annabeth and Grover make an escape, while Percy stays behind and thinks about falling into a fire-infested-hole. He gets set on fire, but manages to also set Arch in St.Louis on fire as well. The chapter ends with Percy jumping from the top of the Arch into the Mississippi River.
A simile because it contains the word “like” in it.
The answer would be “copying from a textbook”